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[Powered by Google Translate] [Sehemu ya 8 - Zaidi Starehe]

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[Rob Bowden - Chuo Kikuu cha Harvard]

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[Hii ni CS50. - CS50.TV]

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>> Hizi sehemu wiki maelezo ni kwenda kuwa pretty mfupi,

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hivyo mimi nina kwenda tu kuendelea kuongea, you guys ni kwenda kuendelea kuuliza maswali,

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na tutaweza kujaribu kujaza juu kama muda kiasi kama inawezekana.

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mengi ya watu wanadhani kwamba pset hii ni lazima si ngumu, lakini ni muda mrefu sana.

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spec pset yenyewe inachukua saa kusoma.

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Sisi kukupa mengi ya SQL unaweza uwezekano haja ya kutumia.

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Sisi kutembea wewe kupitia mengi ya hayo, hivyo ni lazima kuwa mbaya sana.

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Kuna mtu yeyote kuanza au kumaliza?

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Ni pset mwisho. Oh, Mungu wangu.

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Kawaida kuna JavaScript moja baada ya hii, lakini kalenda mabadiliko mambo

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hufanya kila kitu 1 wiki mfupi, na hatuna tena pset JavaScript.

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Sijui jinsi ambayo huathiri kama JavaScript inaenda kuonekana kwenye mtihani

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au Quiz 1.

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Mimi kufikiria itakuwa kitu kama unahitaji kujua mambo ya ngazi ya juu kuhusu JavaScript,

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lakini mimi shaka tunatarajia kutoa tu wewe moja kwa moja JavaScript code

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tangu wewe si alikuwa pset ndani yake.

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Lakini kwamba itakuwa stuff kwa ajili ya mapitio Jaribio wiki ijayo.

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>> Sehemu ya maswali.

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mengi ya mambo haya ni kiasi fulani hafifu kuchukuliwa, lakini tutaweza kujadili nini.

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Tofauti na C, PHP ni "dynamically-typed" lugha. Hii ina maana gani, kuuliza?

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Naam, kusema kwaheri kwa wote wa kuelea wale Char, int, na maneno mengine unahitaji kutumia

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wakati akitangaza vigezo na kazi katika C.

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Katika PHP, aina ya kutofautiana ni kuamua na thamani kwamba ni sasa kufanya.

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Hivyo kabla ya sisi aina hii code katika faili inayoitwa dynamic.php,

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PHP ni dynamically typed. Hiyo ni kweli.

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Sikubaliani na ukweli kwamba hiyo ina maana sisi ni kusema kwaheri Char, kuelea, int,

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na nyingine maneno.

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tofauti kati ya exact dynamically typed na mbadala,

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ambayo ni statically typed, ni kwamba dynamically typed, wote wa kuangalia aina yako na stuff

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hutokea wakati kukimbia, ambapo statically typed hutokea wakati kukusanya.

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neno tuli kwa ujumla inaonekana kuwa na maana ya mambo wakati kukusanya.

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Nadhani kuna matumizi mengine kwa ajili yake, lakini katika C wakati wewe kutangaza variable tuli,

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kuhifadhi yake ni zilizotengwa kwa wakati kukusanya.

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Hapa, dynamically typed tu ina maana kwamba -

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Katika C kama wewe kujaribu kuongeza string na integer, wakati wewe ni kukusanya,

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itakavyo kulalamika kwa sababu ni kwenda kusema kwamba huwezi kuongeza int na pointer.

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Ni tu si operesheni halali.

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Hiyo ni kitu kingine kwamba tutaweza kupata katika pili.

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Lakini kwamba aina ya kuangalia, ukweli kwamba analalamika wakati kukusanya,

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ni tuli aina ya kuangalia.

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Kuna lugha ambapo huna haja ya kusema Char, kuelea, int, na mambo yote hayo,

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lakini lugha unaweza kuwaambia kutoka muktadha wa kitu kile aina ni walidhani kuwa,

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lakini ni bado statically typed.

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Hivyo kama wewe kuchukua 51, OCaml, kamwe haja ya kutumia yoyote ya aina hizi,

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lakini bado itakuwa wakati kukusanya kusema huwezi kufanya hivyo kwa sababu wewe ni kuchanganya int na kamba.

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Dynamically typed tu ina maana kwamba wakati mwingine wakati wa muda kukimbia wewe ni kwenda kupata malalamiko.

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Kama wewe pia kutumika Java kabla, kwa ujumla, karibu yoyote Lugha C-aina

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inaenda statically typed, hivyo C, C + + Java, wale wote ni ujumla statically typed.

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Katika Java wakati kukusanya kitu na wewe ni kusema

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kamba s sawa kitu kipya ambacho si kamba,

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ambayo inaenda kulalamika kwa sababu wale aina tu si match up.

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Hiyo kwenda kulalamika wakati kukusanya.

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Lakini pia ina baadhi ya wakati nguvu mambo kama kama wewe kujaribu kutupwa kitu

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kwa aina hiyo ni maalum zaidi kuliko aina yake ya sasa,

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kuna kitu inaweza kufanya wakati kukusanya kuangalia kama kutupwa kwamba ni kwenda kufanikiwa.

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Java pia ina baadhi ya aina ya nguvu ya kuangalia kwamba haraka kama anapata kwa kuwa mstari wa kanuni

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wakati ni kweli utekelezaji, ni ya kwenda kufanya kutupwa,

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kuangalia kama kutupwa kwamba ilikuwa halali katika nafasi ya kwanza,

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na kama ilikuwa hivyo, basi ni kwenda kulalamika kwamba una aina batili.

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Aina Dynamic kuangalia.

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Aina hii katika faili inayoitwa dynamic.php.

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Dynamic.php.

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Mimi itabidi unzip kwamba formatting.

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Tuna variable, sisi kuweka kwa 7 integer,

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kisha tunakwenda magazeti hayo na s% -

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Oh, sisi ni kuchapa aina ya hivyo, hivyo gettype ni kwenda na kurudi aina ya kutofautiana.

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Sisi ni tu uchapishaji aina ya juu na juu tena.

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Sisi tu php.dynamic.php.

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Tutaweza kuona kwamba mabadiliko kutoka integer kwa kamba Boolean kama sisi kwenda kwa njia.

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Katika C hakuna Boolean data aina, hakuna kamba data aina.

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Kuna * Char na Boolean tu huelekea kuwa int au Char au kitu.

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Katika PHP aina hizi zipo, na hiyo ni moja ya faida kubwa ya PHP juu ya C -

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kwamba string shughuli ni kubwa rahisi katika PHP kuliko C. Wao tu kazi.

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>> Hivyo sisi kurudi hapa.

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Sisi mbio dynamic.php.

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Hii inatuambia mkalimani PHP, aitwaye php, kuendesha PHP code katika dynamic.php.

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Kama una makosa katika faili, mkalimani kukuambia!

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mkalimani, hii ni mwingine tofauti kubwa kati ya PHP na C.

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Katika C una kukusanya kitu fulani na kisha kukimbia kwamba faili compiled.

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Katika PHP kamwe kukusanya chochote.

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Hivyo mkalimani PHP ni kimsingi kusoma tu hii mstari kwa mstari.

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Ni hits var = 7 kisha ni hits printf basi ni hits var basi ni hits printf na kadhalika.

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Kuna ni kidogo ya kuandaa ni gani, na ni Caches matokeo

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hivyo kama wewe kukimbia script baadaye unaweza kufanya baadhi,

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lakini kimsingi ni mstari kwa mstari aina ya kitu.

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Hiyo ina maana kwamba mengi ya optimizations kwamba sisi kupata katika C,

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kama kuandaa, ni kwa ujumla tu compiler unaweza kufanya mengi ya tricks kwa wewe.

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Inaweza kuchukua nje vigezo outnyttjade, inaweza kufanya yote ya aina hii ya mambo,

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inaweza kufanya mkia recursion.

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Katika PHP wewe si kwenda kupata kwamba faida

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sababu tu kwenda kuanza utekelezaji mstari kwa mstari kwa mstari,

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na ni kweli haina kutambua mambo haya kwa urahisi

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tangu siyo 1 kubwa mkusanyiko kupita juu ya jambo na kisha utekelezaji;

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ni tu mstari kwa mstari.

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Basi hiyo ni mkalimani.

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>> Nyuma kwa kuandika wetu nguvu: pretty cool, eh?

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Wewe dhahiri hakuweza kufanya hivyo katika C!

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Sasa, kuona kama unaweza kufikiri aina ya kila moja ya maadili yafuatayo.

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Angalia hii kwa ajili ya kumbukumbu.

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Hivyo 3.50. Ni aina gani unafikiri kwamba kwenda kuwa?

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Hapa ni aina tuna.

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Tuna bools integers,, yaliyo pointi, masharti, arrays, vitu,

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na kisha rasilimali, ambayo ni aina ya hazieleweki.

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Nadhani kuna kweli mfano hapa.

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Kisha kuna null. Null ni aina maalum.

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Tofauti C ambapo null ni tu pointer na anwani 0,

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katika PHP, null ni aina yake ambapo halali tu kitu cha aina hiyo ni null.

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Hii ni muhimu zaidi kwa ajili ya kuangalia makosa.

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Katika C ambapo tulikuwa na suala hili ambapo kama wewe kurudi null,

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haina maana kwamba wewe ni kurudi pointer null au kutumia null kwa ishara ya makosa

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au yote ya kuchanganyikiwa kwamba tulikuwa katika hatua moja.

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Hapa, kurudi null ujumla maana yake ni kosa.

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mambo mengi pia kurejea uongo kwa makosa.

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Lakini uhakika ni aina null, kitu pekee ya aina null ni null.

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Kisha callback ni kama unaweza kufafanua baadhi ya majukumu bila majina.

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Huna kutoa kazi jina, lakini huwezi kuwa ili kukabiliana na kwamba hapa.

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Kuangalia aina kwamba hawana wanatarajia sisi kujua,

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unafikiri nini aina ya 3.50 ni? >> [Mwanafunzi] Kuelea.

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Yeah.

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Hivyo basi hapa, unafikiri nini aina ya hii ni? >> [Mwanafunzi] Array.

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Yeah. Wa kwanza alikuwa kuelea, moja ya pili ni safu.

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Ona kwamba safu hii si kama safu C

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ambapo una index 0 ina baadhi ya thamani, index 1 ina baadhi ya thamani.

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Hapa ni fahirisi, b, na c na maadili ni 1, 2, na 3.

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Katika PHP hakuna tofauti kati ya safu associative na tu safu ya mara kwa mara

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kama ungependa kufikiria hivyo katika C.

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Kuna tu hii, na chini ya Hood safu ya mara kwa mara ni safu associative

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ambapo 0 ramani kwa thamani baadhi njia hiyo ramani kwa thamani fulani.

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Kwa sababu hii, PHP inaweza pretty mbaya kwa kweli mambo haraka code / vigezo

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tangu wakati katika C unatumia safu unajua kwamba kupata mwanachama ni mara kwa mara wakati.

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Katika PHP kupata mwanachama ambaye anajua ni muda gani?

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Ni pengine mara kwa mara ikiwa ni hashes usahihi.

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Nani anajua nini ni kweli kufanya chini ya Hood?

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Wewe kweli haja ya kuangalia utekelezaji wa kuona jinsi itakavyo kukabiliana na kwamba.

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Hivyo basi fopen.

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Nadhani hapa hebu PHP mwongozo fopen kuangalia aina ya kurudi.

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Tunaona hapa unaweza kuangalia juu kiasi pretty kazi yoyote katika mwongozo PHP

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na hii ni aina ya ukurasa mtu wa PHP.

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aina kurudi ni kwenda kuwa rasilimali.

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Hiyo ndiyo sababu nikaona it up, kwa sababu sisi si kweli define rasilimali.

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wazo ya rasilimali, katika C wewe aina ya got * JALADA au chochote;

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katika PHP rasilimali ni JALADA yako *.

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Ni nini wewe kwenda kuwa kusoma kutoka, ni nini wewe kwenda kuwa kuandika.

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Ni kawaida ya nje, hivyo ni rasilimali unaweza kuvuta mambo kutoka na kutupa mambo.

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Na hatimaye, ni nini aina ya null? >> [Mwanafunzi] null.

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Yeah. Hivyo kitu tu kwamba ni null ni null.

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Null ni null.

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>> Moja hulka ya mfumo wa aina PHP (kwa bora au mbaya) ni uwezo wake wa juggle aina.

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Wakati kuandika mstari wa PHP kificho kwamba unachanganya maadili ya aina mbalimbali,

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PHP kujaribu kufanya kitu busara.

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Jaribu nje ya kila ya mistari ifuatayo ya PHP code. Nini kuchapishwa?

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Je, ni nini inatarajiwa? Kwa nini?

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Ukweli huu kuhusu PHP ni nini inafanya nini sisi kuwaita weakly typed.

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Weakly typed na nguvu typed,

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kuna matumizi tofauti kwa sheria hizo,

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lakini watu wengi kutumia weakly typed na nguvu typed kwa maana ya aina hii ya jambo

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ambapo ("1" + 2); kwamba kazi.

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Katika C ambayo si kazi.

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Unaweza kufikiria hili si kazi.

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mengi ya watu msichanganye kuandika nguvu na kuchapa dhaifu na kuchapa tuli na kuandika nguvu.

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Chatu ni mfano mwingine wa lugha hiyo dynamically typed.

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Unaweza kutupa karibu aina katika vigezo na ni kwenda kuamua wakati kukimbia

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checkings makosa yoyote.

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Katika Python itakavyo nitafanya hii na kuona ("1" + 2);

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na hii itakuwa kushindwa kwa sababu anasema huwezi kuongeza string na integer.

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Katika PHP, ambayo ni haki kama dynamically typed, hii si kushindwa.

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Kuandika dhaifu ina nini na ukweli kwamba anafanya mambo kwa aina

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kwamba si kweli kufanya maana lazima.

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Hivyo ("1" + 2); naweza kufikiria kwamba kuwa string 12, naweza kufikiria ni kuwa string 3,

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Naweza kufikiria ni kuwa 3 integer.

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Ni lazima si defined vizuri, na sisi ni pengine kwenda kuona hapa

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kwamba wakati sisi magazeti ("1" + 2); ni pengine ni kwenda kuishia kuwa tofauti

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kuliko uchapishaji (1 + "2").

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Na hii huelekea kuwa, kwa maoni yangu, kwa kuwa mbaya.

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Hapa tunaweza kujaribu haya.

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Mwingine hila kidogo kuhusu PHP ni huna haja ya kweli kuandika kwenye faili.

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Ni haina kukimbia mode amri.

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Hivyo php-r, basi tunaweza kutupa katika amri hapa:

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"Magazeti ('1 '+ 2);" na mimi itabidi kutupa mstari mpya.

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Hii printed 3.

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Inaonekana kama Prints 3 na ni 3 integer.

185
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Hivyo sasa hebu jaribu njia nyingine kote:

186
00:15:38,420 --> 00:15:42,970
"Magazeti (1 + '2 ');

187
00:15:45,560 --> 00:15:50,490
Sisi kupata 3, na ni pia kwenda kuwa integer 3? Mimi uaminifu hawana wazo.

188
00:15:50,490 --> 00:15:54,030
Inaonekana kama kwamba ni thabiti.

189
00:15:54,030 --> 00:15:59,550
Kuna kamwe nafasi yoyote ya kuwa ni 12 string au kitu kama hicho

190
00:15:59,550 --> 00:16:08,080
kwa sababu PHP, tofauti na JavaScript Java pia,

191
00:16:08,080 --> 00:16:11,670
ina operator tofauti kwa ajili ya concatenation.

192
00:16:11,670 --> 00:16:14,930
Concatenation katika PHP ni dot.

193
00:16:14,930 --> 00:16:22,950
Hivyo uchapishaji (1 '2 '.); Ni kwenda kutupa 12.

194
00:16:25,790 --> 00:16:32,420
Hii inaelekeza kusababisha machafuko ambapo watu kujaribu kufanya kitu kama str + =

195
00:16:32,420 --> 00:16:37,840
baadhi kitu kingine kwamba wanataka kuongeza juu ya mwisho wa kamba zao, na kwamba itakuja kushindwa.

196
00:16:37,840 --> 00:16:40,770
Unahitaji kufanya str =.

197
00:16:42,000 --> 00:16:46,240
Hivyo usisahau concatenation katika PHP ni dot.

198
00:16:46,240 --> 00:16:52,100
Mambo mengine ya kujaribu: magazeti ("CS" + 50);

199
00:16:55,750 --> 00:17:03,610
Nimekuwa niliwaambieni kwamba hakuna matumaini ya hii kusababisha CS50

200
00:17:03,610 --> 00:17:06,119
tangu concatenation si +.

201
00:17:06,119 --> 00:17:08,440
Unafikiri hii ni kwenda kuishia kuwa?

202
00:17:10,359 --> 00:17:13,460
Mimi uaminifu na kabisa hakuna wazo.

203
00:17:14,250 --> 00:17:16,460
Inaonekana kama ni 50 tu.

204
00:17:16,460 --> 00:17:21,490
Ni anaona kamba, na I bet kama sisi kuweka 123CS -

205
00:17:21,490 --> 00:17:29,640
Ni anaona kamba ya kwanza, inajaribu kusoma integer kutoka humo au idadi kutoka humo.

206
00:17:29,640 --> 00:17:31,710
Katika kesi hiyo ni anaona 123CS.

207
00:17:31,710 --> 00:17:35,190
"Hiyo haina maana kama integer, hivyo mimi nina kwenda tu kufikiri ya 123."

208
00:17:35,190 --> 00:17:38,580
Hivyo 123 + 50 ni kwenda kuwa 173.

209
00:17:38,580 --> 00:17:40,740
Na hapa ni kuanza kusoma hii kama integer.

210
00:17:40,740 --> 00:17:45,690
Haina kuona kitu, hivyo tu chipsi kama 0. Hivyo 0 + 50 ni kwenda kuwa 50.

211
00:17:45,690 --> 00:17:51,600
Hii mimi nina kuchukua anaenda kufanya kitu sawa.

212
00:17:51,600 --> 00:17:54,310
Mimi nina mawazo 99.

213
00:17:54,310 --> 00:17:57,580
Yeah, kwa sababu ni kwenda kuchukua kwanza -

214
00:18:12,880 --> 00:18:15,730
Hivyo 99.

215
00:18:15,730 --> 00:18:21,970
Hapa (10/7), kama hii walikuwa C, gani kwamba kurudi?

216
00:18:23,700 --> 00:18:29,630
[Mwanafunzi] 1. >> Yeah, itakuwa 1 kwa sababu 10/7 ni kugawa integers 2.

217
00:18:29,630 --> 00:18:32,910
integer kugawanywa na integer ni kwenda na kurudi integer.

218
00:18:32,910 --> 00:18:37,750
Ni hawezi kurudi 1 uhakika chochote kwamba itakuwa, hivyo tu kwenda na kurudi 1.

219
00:18:37,750 --> 00:18:46,120
Hapa uchapishaji (10/7); itakavyo kweli kutafsiri kwamba.

220
00:18:46,120 --> 00:18:53,760
Na hii ina maana kwamba kama kweli wanataka kufanya rounding integer na mambo kama hayo,

221
00:18:53,760 --> 00:18:59,950
unahitaji kufanya magazeti (sakafu (10/7));

222
00:18:59,950 --> 00:19:08,460
Katika C ni pengine weird kwamba unaweza kuwategemea truncation integer mara kwa mara,

223
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lakini katika PHP huwezi kwa sababu itakuwa moja kwa moja kugeuka ndani kuelea.

224
00:19:13,430 --> 00:19:17,610
Na kisha (7 + kweli); unafikiri kwamba kwenda kuwa?

225
00:19:18,550 --> 00:19:23,640
Mimi guessing 8 ikiwa ni kwenda kutafsiri kweli kama 1.

226
00:19:23,640 --> 00:19:25,740
Inaonekana kama ni 8.

227
00:19:25,740 --> 00:19:31,710
>> Hivyo chochote tumefanya katika dakika 10 iliyopita unapaswa kabisa kamwe kufanya.

228
00:19:31,710 --> 00:19:39,870
Utaona kificho kwamba hana huu.

229
00:19:39,870 --> 00:19:42,700
Haina kuwa kama moja kwa moja kama hii.

230
00:19:42,700 --> 00:19:47,240
Unaweza kuwa na vigezo 2, na 1 variable hutokea kwa kuwa string

231
00:19:47,240 --> 00:19:51,310
na kutofautiana nyingine hutokea kwa kuwa int, na kisha kuongeza vigezo haya pamoja.

232
00:19:51,310 --> 00:20:00,120
Tangu PHP ni dynamically typed na itakuwa si kufanya lolote kuangalia aina kwa wewe

233
00:20:00,120 --> 00:20:03,640
na tangu ni weakly typed na tangu itakuwa tu moja kwa moja kutupa mambo haya pamoja

234
00:20:03,640 --> 00:20:11,490
na kila kitu tu kazi, ni vigumu hata kujua kuwa kutofautiana hii ni lazima string sasa,

235
00:20:11,490 --> 00:20:14,930
hivyo mimi si lazima kuongeza kwa variable huu, ambayo ni integer.

236
00:20:18,780 --> 00:20:24,560
Njia bora ni kama variable ni kamba, kuitunza kama string milele.

237
00:20:24,560 --> 00:20:26,980
Kama kutofautiana ni int, kuitunza kama int milele.

238
00:20:26,980 --> 00:20:30,770
Kama unataka kukabiliana na integers na masharti,

239
00:20:30,770 --> 00:20:36,970
unaweza kutumia varsint - kwamba ni JavaScript.

240
00:20:36,970 --> 00:20:42,520
Intval. Mimi kufanya hili wakati wote. PHP na JavaScript mimi kuchanganya kila kitu.

241
00:20:42,520 --> 00:20:47,600
Hivyo intval ni kwenda na kurudi thamani integer ya kutofautiana.

242
00:20:47,600 --> 00:20:56,550
Kama sisi kupita katika "magazeti (intval ('123 ')); kupata 123.

243
00:21:06,820 --> 00:21:15,850
Intval yenyewe si kwenda kufanya kuangalia kwa sisi kuwa ni peke integer.

244
00:21:15,850 --> 00:21:20,460
Mwongozo PHP, kuna tu wengi kazi zilizopo,

245
00:21:20,460 --> 00:21:26,560
hivyo hapa nadhani nini napenda kutumia ni is_numeric kwanza.

246
00:21:26,560 --> 00:21:32,590
Mimi guessing kwamba alirudi uongo.

247
00:21:32,590 --> 00:21:35,780
Hiyo ni jambo lingine tuna kwenda juu ni ===.

248
00:21:37,850 --> 00:21:44,020
Hivyo is_numeric ('123df '), wewe bila kufikiri ya kwamba kama is_numeric.

249
00:21:44,020 --> 00:21:46,720
Katika C ingekuwa iterate juu ya wahusika wote

250
00:21:46,720 --> 00:21:50,410
na kuangalia kuona kama tabia ya kila ni tarakimu au chochote.

251
00:21:50,410 --> 00:21:53,850
Hapa is_numeric ni kwenda kufanya hivyo kwa ajili yetu,

252
00:21:53,850 --> 00:21:56,520
na ni kurudi uongo.

253
00:21:56,520 --> 00:22:02,120
Hivyo wakati mimi kuchapishwa kwamba, kuchapishwa kitu, hivyo hapa mimi kulinganisha kuona,

254
00:22:02,120 --> 00:22:05,490
gani kutokea kwa kuwa uongo? Na hivyo sasa ni kuchapa 1.

255
00:22:05,490 --> 00:22:10,060
Inavyoonekana ni Prints 1 kama kweli badala ya uchapishaji wa kweli kama kweli.

256
00:22:10,060 --> 00:22:15,790
Nashangaa kama mimi kufanya print_r. Hapana, bado anafanya 1.

257
00:22:15,790 --> 00:22:26,760
>> Tukirudi kwenye ===, == bado lipo,

258
00:22:26,760 --> 00:22:32,260
na kama wewe kuzungumza na Tommy yeye itabidi kusema == ni kikamilifu faini.

259
00:22:32,260 --> 00:22:37,700
Mimi nina kwenda kusema kwamba == ni ya kutisha na kamwe kutumia ==.

260
00:22:37,700 --> 00:22:44,870
Tofauti ni kwamba == inalinganishwa mambo

261
00:22:44,870 --> 00:22:48,450
ambapo inaweza kuwa kweli hata kama wao siyo aina moja,

262
00:22:48,450 --> 00:22:53,810
ambapo === inalinganishwa na mambo ya kwanza ni hundi ni wao aina moja?

263
00:22:53,810 --> 00:22:58,010
Ndiyo. Sawa, sasa mimi naenda kuona kama kweli kulinganisha na kuwa sawa.

264
00:22:58,010 --> 00:23:08,890
Unaweza kupata weird mambo kama 10 sawa - basi s kuona nini kwamba anasema.

265
00:23:08,890 --> 00:23:15,570
Hivyo ('10 '== '1 E1');

266
00:23:15,570 --> 00:23:17,980
Hii anarudi kweli.

267
00:23:17,980 --> 00:23:21,420
Je, mtu yeyote kuwa guesses yoyote kwa nini hii anarudi kweli?

268
00:23:25,180 --> 00:23:27,120
Ni si tu kuhusu hiyo. Labda hii ni hint.

269
00:23:27,120 --> 00:23:33,170
Lakini kama mimi kubadili kwamba kwa f - darn hivyo! Naendelea kutumia quotes mbili.

270
00:23:33,170 --> 00:23:38,780
sababu quotes mbili ni yelling saa yangu ni kwa sababu nimekuwa kuweka hii katika quotes mbili.

271
00:23:38,780 --> 00:23:43,850
Hivyo mimi anaweza kutoroka quotes mbili katika hapa, lakini enda quotes iwe rahisi.

272
00:23:43,850 --> 00:23:49,120
Hivyo ('10 '== '1 F1'); haina magazeti ya kweli. ('10 '== '1 E1'); Prints kweli.

273
00:23:49,120 --> 00:23:56,330
[Mwanafunzi] Je, ni hex? >> Ni si hex, lakini ni karibu kwamba ni kama -

274
00:23:56,330 --> 00:24:01,060
1e1, kisayansi nukuu.

275
00:24:01,060 --> 00:24:07,950
Ni inatambua 1e1 kama 1 * 10 ^ 1 au chochote.

276
00:24:07,950 --> 00:24:11,510
Wale ni sawa integers.

277
00:24:11,510 --> 00:24:15,930
Kama sisi kufanya === kisha itakuja kuwa uongo.

278
00:24:15,930 --> 00:24:28,490
Mimi kwa kweli sielewi kama sisi kufanya == nini kuhusu (10 na '10abc ');? Wote haki. Basi hiyo ni kweli.

279
00:24:28,490 --> 00:24:35,940
Hivyo tu kama wakati wewe gani (10 + '10abc '); na itakuwa 20,

280
00:24:35,940 --> 00:24:38,800
hapa (10 == '10abc '); ni kweli.

281
00:24:38,800 --> 00:24:45,350
Hata mbaya ni mambo kama (uongo == null); ni kweli

282
00:24:45,350 --> 00:24:52,210
au (uongo == 0); ni kweli, (uongo == []);

283
00:24:52,210 --> 00:25:00,970
Kuna weird kesi ya - Hiyo ni moja ya kesi hizo weird.

284
00:25:00,970 --> 00:25:08,110
Ona kwamba (uongo == []); ni kweli.

285
00:25:08,110 --> 00:25:11,950
('0 '== Uongo); ni kweli.

286
00:25:11,950 --> 00:25:16,090
('0 '== []); Ni uongo.

287
00:25:16,090 --> 00:25:19,090
Hivyo == ni kwa njia yoyote elekezi.

288
00:25:19,090 --> 00:25:26,830
inaweza kuwa sawa na b na inaweza kuwa sawa na c,

289
00:25:26,830 --> 00:25:29,340
lakini b wanaweza kuwa sawa na c.

290
00:25:29,340 --> 00:25:35,580
Hiyo ni chukizo kwangu, na unapaswa daima kutumia ===.

291
00:25:35,580 --> 00:25:38,590
[Mwanafunzi] Je, tunaweza kufanya ==! Kama vile? >> [Bowden] Ndiyo.

292
00:25:38,590 --> 00:25:44,600
sawa itakuwa! = na ==!.

293
00:25:44,600 --> 00:25:48,230
Hii ni kweli kuletwa juu katika spec pset

294
00:25:48,230 --> 00:25:52,000
ambapo mengi ya kurudi utendaji -

295
00:25:52,000 --> 00:25:53,890
Mwongozo PHP ni nzuri kuhusu hili.

296
00:25:53,890 --> 00:25:59,140
Ni unaweka katika sanduku kubwa nyekundu, "Hii atarudi uongo kama kuna kosa."

297
00:25:59,140 --> 00:26:03,940
Lakini wanaorejea 0 ni kitu kikamilifu busara kurudi.

298
00:26:03,940 --> 00:26:08,250
Fikiria juu ya kazi yoyote ambayo inatarajiwa kurudi integer.

299
00:26:11,250 --> 00:26:17,880
Hebu sema kazi hii ni walidhani kuhesabu idadi ya mistari katika faili au kitu.

300
00:26:17,880 --> 00:26:23,490
Katika hali ya kawaida, unaweza kupita kazi hii faili

301
00:26:23,490 --> 00:26:27,120
na ni kwenda na kurudi integer ambayo inawakilisha idadi ya mistari.

302
00:26:27,120 --> 00:26:30,820
Hivyo 0 ni namba kikamilifu busara kama faili ni tupu.

303
00:26:30,820 --> 00:26:36,810
Lakini nini kama wewe kupita faili batili na kazi hufanyika kurudi uongo

304
00:26:36,810 --> 00:26:38,860
kama wewe kupita faili batili?

305
00:26:38,860 --> 00:26:46,500
Kama wewe tu kufanya == wewe si kutofautisha kati ya kesi faili batili na faili tupu.

306
00:26:48,870 --> 00:26:51,350
Daima kutumia ===.

307
00:26:55,690 --> 00:26:58,000
Hiyo yote ya wale.

308
00:26:58,000 --> 00:27:01,660
>> Katika PHP, aina safu ni tofauti na kile wewe kutumika katika C.

309
00:27:01,660 --> 00:27:06,650
Hakika, unaweza kuwa tayari niliona hii hapo juu wakati tuliona kwamba huu ni wa safu aina.

310
00:27:06,650 --> 00:27:15,640
syntax bracket ni mpya kama ya PHP 5.4, ambayo ni toleo newest wa PHP.

311
00:27:15,640 --> 00:27:36,960
Kabla ya hii wewe daima alikuwa kuandika array ('' -> 1, 'b' -> 2.

312
00:27:36,960 --> 00:27:41,160
Hiyo ilikuwa kuujenga kwa safu.

313
00:27:41,160 --> 00:27:45,950
Sasa PHP ina hatimaye kuja karibu na syntax nice ya mabano tu za mraba,

314
00:27:45,950 --> 00:27:50,900
ambayo ni kiasi tu bora kuliko safu.

315
00:27:50,900 --> 00:27:54,480
Lakini kwa kuzingatia PHP 5.4 ni toleo jipya,

316
00:27:54,480 --> 00:27:59,090
unaweza kukutana na maeneo ambayo hawana hata PHP 5.3.

317
00:27:59,090 --> 00:28:08,220
Zaidi ya majira ya sisi mbio katika suala hili ambapo PHP 5.3 ilikuwa nini tulikuwa juu ya appliance,

318
00:28:08,220 --> 00:28:14,480
lakini server kwamba sisi uliotumika daraja wetu wote kitabu na kuwasilisha na mambo ambayo yote kwa

319
00:28:14,480 --> 00:28:16,750
ilikuwa PHP 5.4.

320
00:28:16,750 --> 00:28:23,060
Bila kujua hii, sisi maendeleo katika 5.3, alisukuma kwa 5.4,

321
00:28:23,060 --> 00:28:25,660
na sasa wote wa hakuna ghafla ya maadili ya kazi zetu

322
00:28:25,660 --> 00:28:28,680
sababu kuna kilichotokea kuwa mabadiliko kati ya 5.3 na 5.4

323
00:28:28,680 --> 00:28:31,030
ambayo si nyuma sambamba,

324
00:28:31,030 --> 00:28:35,770
na sisi kwenda na kurekebisha mambo yote yetu kwamba si kazi kwa PHP 5.4.

325
00:28:39,210 --> 00:28:42,320
Kwa darasa hili, tangu appliance gani kuwa PHP 5.4,

326
00:28:42,320 --> 00:28:45,490
ni kikamilifu faini ya kutumia mabano mraba.

327
00:28:47,240 --> 00:28:50,440
Lakini kama wewe ni kuangalia juu ya mambo karibu mtandao,

328
00:28:50,440 --> 00:28:54,880
kama wewe ni kuangalia juu ya baadhi ya aina ya mambo ya safu, uwezekano mkubwa wewe utaenda kuona

329
00:28:54,880 --> 00:29:02,020
Spell nje safu syntax kuujenga tangu kwamba imekuwa karibu tangu PHP alizaliwa

330
00:29:02,020 --> 00:29:07,340
na mraba bracket syntax imekuwa karibu kwa kipindi cha miezi michache

331
00:29:07,340 --> 00:29:10,020
au wakati wowote 5.4 alikuja karibu.

332
00:29:10,020 --> 00:29:12,710
Hii ni jinsi gani ya index.

333
00:29:12,710 --> 00:29:30,610
Tu kama katika C jinsi wewe ungekuwa index kwa mabano mraba kama $ safu [0], $ safu [1], $ safu [2],

334
00:29:30,610 --> 00:29:36,320
wewe index njia sawa kama wewe kutokea kwa kuwa fahirisi yako kuwa masharti.

335
00:29:36,320 --> 00:29:40,440
Hivyo $ safu [''] na $ safu ['b'].

336
00:29:40,440 --> 00:29:47,410
$ Safu [b]. Kwa nini hii ni makosa?

337
00:29:52,490 --> 00:29:59,870
Ni pengine kuzalisha onyo lakini bado kazi. PHP huelekea kufanya hivyo.

338
00:29:59,870 --> 00:30:04,890
Ni huelekea tu, "Mimi naenda kuwaonyeni kuhusu hili, lakini nina kwenda tu na kuendelea

339
00:30:04,890 --> 00:30:07,550
"Na kufanya chochote naweza."

340
00:30:07,550 --> 00:30:11,500
Ni pengine kutafsiri hii kwa kamba,

341
00:30:11,500 --> 00:30:15,000
lakini inawezekana kwamba wakati fulani katika kipindi cha mtu alisema

342
00:30:15,000 --> 00:30:20,180
define b kuwa 'HELLO DUNIANI'.

343
00:30:20,180 --> 00:30:28,740
Hivyo sasa b inaweza kuwa safu ya mara kwa mara na $ [b] mapenzi kweli kuwa kufanya 'HELLO DUNIANI'.

344
00:30:28,740 --> 00:30:32,380
Nadhani katika hatua hii, au angalau wetu mazingira ya PHP,

345
00:30:32,380 --> 00:30:37,870
kama wewe kujaribu index katika safu na muhimu kwamba haipo, itatoweka.

346
00:30:37,870 --> 00:30:40,150
Sidhani itakuwa tu kuwaonya.

347
00:30:40,150 --> 00:30:44,560
Au angalau unaweza kuweka hivyo kwamba si tu kuwaonya ninyi, ni tu sawa sawa juu inashindwa.

348
00:30:44,560 --> 00:30:49,290
>> njia kuangalia kuona kama kuna kweli ni index vile ni isset.

349
00:30:49,290 --> 00:30:54,690
Hivyo isset ($ safu ['HELLO DUNIANI']) atarudi uongo.

350
00:30:54,690 --> 00:30:59,160
isset ($ safu ['b']) atarudi kweli.

351
00:31:06,830 --> 00:31:09,880
Unaweza kuchanganya syntaxes haya.

352
00:31:15,060 --> 00:31:22,440
Nina uhakika pretty nini safu hii ingekuwa kuishia kuwa ni - Tunaweza mtihani ni nje.

353
00:31:43,290 --> 00:31:45,700
Oh, mimi haja PHPWord.

354
00:31:53,960 --> 00:32:00,260
Hii ni kuchanganya syntax ambapo wewe bayana nini ni muhimu

355
00:32:00,260 --> 00:32:03,330
na huna bayana nini ni muhimu.

356
00:32:03,330 --> 00:32:05,520
Hivyo 3 haki hapa ni thamani.

357
00:32:05,520 --> 00:32:08,080
Wewe si wazi alisema nini ufunguo wake ni kwenda kuwa.

358
00:32:08,080 --> 00:32:11,670
Unafikiri ufunguo wake ni kwenda kuwa?

359
00:32:11,670 --> 00:32:21,410
[Mwanafunzi] 0. >> Mimi guessing 0 tu kwa sababu ni moja ya kwanza sisi si maalum.

360
00:32:21,410 --> 00:32:23,500
Tunaweza kweli kufanya michache ya kesi hizi.

361
00:32:23,500 --> 00:32:28,030
Hivyo print_r ni magazeti ya kujirudia. Itakuwa magazeti safu nzima.

362
00:32:28,030 --> 00:32:32,700
Ingekuwa magazeti subarrays wa safu kama kulikuwa na yeyote.

363
00:32:32,700 --> 00:32:36,630
Hivyo print_r ($ safu); php.test.php.

364
00:32:36,630 --> 00:32:38,810
Ni haina kuangalia kama ni akampa 0.

365
00:32:38,810 --> 00:32:43,530
Kuna kweli kitu cha kukumbuka hapa, lakini tutaweza kupata nyuma yake katika pili.

366
00:32:43,530 --> 00:32:45,850
Lakini nini kama mimi kutokea kwa kufanya hii index 1?

367
00:32:45,850 --> 00:32:51,170
PHP haina kutofautisha kati ya fahirisi kamba na fahirisi integer,

368
00:32:51,170 --> 00:33:00,280
hivyo katika hatua hii nimekuwa tu defined index 1 na mimi wanaweza kufanya wawili safu $ [1] na $ safu ['1 ']

369
00:33:00,280 --> 00:33:06,250
na itakuwa sawa na index ufunguo huo.

370
00:33:06,250 --> 00:33:13,000
Hivyo sasa unafikiri 3 ni kwenda kuwa? >> [Mwanafunzi] 2. >> [Bowden] Mimi guessing 2.

371
00:33:16,000 --> 00:33:18,690
Yeah. Ni 2.

372
00:33:18,690 --> 00:33:24,790
Nini kama sisi alifanya hivyo ni 10, hii ni 4? Unafikiri index ya 3 ni kwenda kuwa?

373
00:33:27,360 --> 00:33:29,110
Mimi nina mawazo 11.

374
00:33:29,110 --> 00:33:33,060
Dhana yangu kama yale PHP gani - na nadhani nimepata kuona hii kabla -

375
00:33:33,060 --> 00:33:39,760
je, ni kuvaa tu wimbo wa nini juu numeric index ni kutumika hadi sasa ni.

376
00:33:39,760 --> 00:33:44,230
Ni kamwe kwenda hawawajui index kamba 3. Ni daima kuwa index numeric.

377
00:33:44,230 --> 00:33:47,690
Hivyo anaendelea kufuatilia kwa moja juu ni kupewa hivyo mbali, ambayo hufanyika kuwa 10,

378
00:33:47,690 --> 00:33:52,540
na ni kwenda kutoa 11-3.

379
00:33:52,540 --> 00:34:02,110
Kile alisema kabla, taarifa ya njia ni uchapishaji hii safu.

380
00:34:02,110 --> 00:34:06,850
Ni Prints 10 muhimu, muhimu 4, muhimu 11, muhimu d.

381
00:34:06,850 --> 00:34:09,790
Au hata hebu kufanya -

382
00:34:15,760 --> 00:34:22,489
Mimi nadhani hawakutia 0, lakini ni uchapishaji 1, 2, 3, 4.

383
00:34:22,489 --> 00:34:29,330
Nini kama mimi kubadili hapa? Au hebu kweli kubadili hizi 2.

384
00:34:29,330 --> 00:34:31,940
Sasa Prints 2, 1, 3, 4.

385
00:34:31,940 --> 00:34:41,270
PHP ya arrays si tu kama meza yako mara kwa mara hash.

386
00:34:41,270 --> 00:34:45,570
Ni kikamilifu busara kufikiri wao kama meza hash 99% ya muda.

387
00:34:45,570 --> 00:34:53,790
Lakini katika meza yako hash hakuna maana ya utaratibu ambao walikuwa mambo kuingizwa.

388
00:34:53,790 --> 00:34:56,639
Hivyo kwa haraka kama wewe kuingiza katika meza yako hash,

389
00:34:56,639 --> 00:35:00,590
kudhani hakuna orodha wanaohusishwa na unaweza kuhukumu ndani ya orodha wanaohusishwa

390
00:35:00,590 --> 00:35:03,980
ambayo ilikuwa kuingizwa kwanza.

391
00:35:03,980 --> 00:35:10,060
Lakini hapa sisi kuingizwa 2 ya kwanza na anajua wakati ni uchapishaji nje hii safu kwamba 2 anakuja kwanza.

392
00:35:10,060 --> 00:35:13,090
Haina magazeti ni nje katika tu ili yeyote.

393
00:35:13,090 --> 00:35:17,550
kiufundi data muundo kwamba ni kwa kutumia ramani ni amri,

394
00:35:17,550 --> 00:35:24,690
hivyo ni ramani funguo kwa maadili na anakumbuka utaratibu ambao funguo hizo kuingizwa.

395
00:35:24,690 --> 00:35:31,600
Kimsingi ni kwa baadhi ya matatizo ambapo ni annoying kweli -

396
00:35:31,600 --> 00:35:34,510
Hebu sema una safu 0, 1, 2, 3, 4, 5

397
00:35:34,510 --> 00:35:37,700
na unataka kuchukua nje index 2.

398
00:35:37,700 --> 00:35:47,750
Njia moja ya kufanya hivyo, hebu angalia nini kwamba inaonekana kama.

399
00:35:47,750 --> 00:35:50,410
0, 2, 1, 3, 4.

400
00:35:50,410 --> 00:35:54,880
Unset kinachotokea kwa unset vigezo wote na fahirisi safu.

401
00:35:54,880 --> 00:35:58,630
Hivyo unset ($ safu [2]);

402
00:35:58,630 --> 00:36:03,430
Sasa nini hii kwenda kuangalia kama? 2 ni tu gone, ili kikamilifu faini.

403
00:36:03,430 --> 00:36:11,670
Zaidi annoying ni kama unataka mambo ya kweli kuwa kama safu.

404
00:36:11,670 --> 00:36:14,910
Mimi itabidi kuweka namba random.

405
00:36:14,910 --> 00:36:20,400
Sasa taarifa fahirisi yangu.

406
00:36:20,400 --> 00:36:26,860
Mimi nataka tu kuwa kama safu C ambapo unaendelea kutoka 0 kwa urefu - 1

407
00:36:26,860 --> 00:36:30,810
na siwezi iterate juu yake kama vile.

408
00:36:30,810 --> 00:36:38,520
Lakini kwa haraka kama mimi unset index pili, nini ilikuwa katika index 3 haina sasa kuwa index 2.

409
00:36:38,520 --> 00:36:44,790
Badala yake tu kuondosha kwamba index na sasa wewe kwenda 0, 1, 3, 4.

410
00:36:44,790 --> 00:36:48,740
Hii ni kikamilifu kuridhisha.

411
00:36:48,740 --> 00:36:53,950
Ni tu annoying na kufanya mambo kama ganga safu. Yeah.

412
00:36:53,950 --> 00:36:57,200
>> [Mwanafunzi] Nini kingetokea kama alikuwa kwa kitanzi

413
00:36:57,200 --> 00:36:59,630
na wewe alitaka kwenda juu ya mambo yote?

414
00:36:59,630 --> 00:37:02,290
Wakati hit 2, ingekuwa yatoa milele?

415
00:37:02,290 --> 00:37:10,150
Iterating juu ya safu. Kuna njia 2 unaweza kufanya hivyo.

416
00:37:10,150 --> 00:37:12,770
Unaweza kutumia mara kwa mara kwa kitanzi.

417
00:37:12,770 --> 00:37:22,000
Hii ni nyingine intricacy ya PHP.

418
00:37:22,000 --> 00:37:27,420
Lugha nyingi, napenda kusema, na aina fulani ya urefu au len au kitu

419
00:37:27,420 --> 00:37:30,470
ikionyesha urefu wa safu.

420
00:37:30,470 --> 00:37:32,820
Katika PHP ni kuhesabu.

421
00:37:32,820 --> 00:37:36,160
Hivyo kuhesabu ($ safu); $ i + +)

422
00:37:36,160 --> 00:37:42,950
Hebu tu magazeti ($ safu [$ i]);

423
00:37:45,920 --> 00:37:48,820
Tangazo: Undefined kukabiliana: 2.

424
00:37:48,820 --> 00:37:51,610
Ni tu kwenda kushindwa.

425
00:37:51,610 --> 00:38:03,020
Hii ni sababu ya kwamba, kwa sehemu kubwa, kamwe haja iterate juu ya safu kama hii.

426
00:38:03,020 --> 00:38:07,110
Inaweza kuwa ni exaggeration, lakini kamwe haja iterate juu ya safu kama hii

427
00:38:07,110 --> 00:38:19,410
kwa sababu PHP hutoa syntax yake foreach ambapo foreach ($ safu kama $ bidhaa).

428
00:38:19,410 --> 00:38:31,830
Sasa kama sisi magazeti ($ item); - we'll kujadili katika pili - kwamba kazi kikamilifu faini.

429
00:38:31,830 --> 00:38:38,960
njia ambayo foreach ni kazi ni hoja ya kwanza ni safu ya kwamba wewe ni iterating juu.

430
00:38:38,960 --> 00:38:44,060
Na hoja ya pili, item, njia ya kila mwanya wa kwa kitanzi

431
00:38:44,060 --> 00:38:52,690
ni kwenda kuchukua juu ya jambo la pili katika safu. Hivyo kumbuka safu ina utaratibu.

432
00:38:52,690 --> 00:38:55,690
mara ya kwanza kupitia kwa kitanzi, item ni kwenda kuwa 123

433
00:38:55,690 --> 00:38:59,540
basi itakuwa 12 basi itakuwa 13 basi itakuwa 23 basi itakuwa 213.

434
00:38:59,540 --> 00:39:04,670
Mambo kupata kweli weird wakati wa kufanya kitu kama foreach.

435
00:39:04,670 --> 00:39:07,480
Hebu kuona nini kinatokea kwa sababu wewe kamwe kufanya hivyo.

436
00:39:07,480 --> 00:39:13,320
Nini kama sisi unset ($ safu [1]);

437
00:39:20,410 --> 00:39:26,030
Hiyo ilikuwa pengine ilivyotarajiwa.

438
00:39:26,030 --> 00:39:30,950
Wewe ni juu ya safu hii iterating, na kila wakati wewe ni unsetting index kwanza.

439
00:39:30,950 --> 00:39:39,720
Hivyo kwa index 0, jambo la kwanza, item inachukua thamani 0, hivyo ni kwenda kuwa 123.

440
00:39:39,720 --> 00:39:44,630
Lakini ndani ya kitanzi kwa sisi unset index 1, hivyo kwamba maana ya 12 ni gone.

441
00:39:44,630 --> 00:39:57,480
Hivyo magazeti. PHP_EOL.

442
00:39:57,480 --> 00:40:03,580
PHP_EOL ni tu newline, lakini ni ya kitaalam zaidi portable

443
00:40:03,580 --> 00:40:08,890
tangu newlines katika Windows ni tofauti na newlines juu ya Mac na UNIX.

444
00:40:08,890 --> 00:40:18,040
On Windows newline ni \ r \ n, ambapo kila mahali pengine huelekea tu kuwa \ n.

445
00:40:18,040 --> 00:40:25,150
PHP_EOL kimeundwa ili anatumia chochote newline ya mfumo wako ni.

446
00:40:25,150 --> 00:40:29,310
Hivyo magazeti kwamba. Hebu si print_r ($ safu) mwishoni.

447
00:40:32,830 --> 00:40:37,390
Mimi nilikuwa na wazo kwamba itakuwa tabia.

448
00:40:41,740 --> 00:40:48,960
Item bado inachukua thamani 12 ingawa sisi unset 12 kabla ya sisi milele got ni kutoka safu.

449
00:40:52,770 --> 00:40:58,840
Msiwafanye neno langu juu ya hili, lakini inaonekana kama foreach inajenga nakala ya safu

450
00:40:58,840 --> 00:41:02,160
na kisha item inachukua maadili yote ya nakala ya kwamba.

451
00:41:02,160 --> 00:41:07,760
Hivyo hata kama wewe kurekebisha safu ndani kwa kitanzi,

452
00:41:07,760 --> 00:41:17,240
itakuwa si huduma. Item itachukua juu ya maadili ya awali.

453
00:41:17,240 --> 00:41:19,240
Hebu jaribu unsetting yake.

454
00:41:19,240 --> 00:41:24,460
Nini kama hii ni $ safu [1] = "hello";

455
00:41:24,460 --> 00:41:31,770
Hata ingawa sisi kuweka "hello" katika safu, item kamwe inachukua thamani hiyo.

456
00:41:31,770 --> 00:41:37,430
Kuna mwingine syntax kwa foreach matanzi

457
00:41:37,430 --> 00:41:45,900
ambapo wewe kuweka vigezo 2 waliojitenga na mshale.

458
00:41:45,900 --> 00:41:49,680
Hii variable kwanza ni kwenda kuwa ufunguo wa thamani kwamba,

459
00:41:49,680 --> 00:41:53,050
na hii variable pili ni kwenda kuwa sawa exact bidhaa.

460
00:41:53,050 --> 00:42:01,610
Hii ni uninteresting hapa, lakini kama sisi kwenda nyuma ya kesi yetu ya awali ya '-> 1,

461
00:42:01,610 --> 00:42:06,090
'B' -> 1,

462
00:42:06,090 --> 00:42:14,470
hapa kama sisi tu iterate kwa kila safu kama bidhaa, bidhaa ni kwenda kuwa 1 kila wakati.

463
00:42:14,470 --> 00:42:18,170
Lakini kama sisi pia wanataka kujua muhimu zinazohusiana na bidhaa kwamba

464
00:42:18,170 --> 00:42:25,230
kisha sisi kufanya kama $ muhimu -> $ item.

465
00:42:25,230 --> 00:42:31,980
Hivyo sasa tunaweza kufanya magazeti ($ muhimu. ':'.

466
00:42:31,980 --> 00:42:39,380
Sasa ni juu ya iterating na uchapishaji kila ufunguo na thamani yake kuhusishwa.

467
00:42:39,380 --> 00:42:47,030
>> Jambo ziada tunaweza kufanya katika foreach matanzi ni unaweza kuona hii syntax.

468
00:42:47,030 --> 00:42:54,770
Ampersands kabla majina variable huwa na kuwa jinsi gani PHP rejea.

469
00:42:54,770 --> 00:43:00,460
Ambapo marejeo ni sawa na kuyatumia,

470
00:43:00,460 --> 00:43:04,820
huna kuyatumia, hivyo kamwe kukabiliana na kumbukumbu moja kwa moja.

471
00:43:04,820 --> 00:43:12,620
Lakini una kumbukumbu ambapo 1 variable inahusu kitu sawa kama variable mwingine.

472
00:43:12,620 --> 00:43:21,450
Ndani ya hapa hebu kufanya $ item. Turudi kwa 1, 10.

473
00:43:21,450 --> 00:43:28,800
Hebu kufanya $ item + +; Kwamba bado lipo katika PHP. Unaweza bado kufanya + +.

474
00:43:28,800 --> 00:43:38,260
php.test.php. Nina magazeti hayo. print_r ($ safu);

475
00:43:38,260 --> 00:43:42,730
Sisi magazeti 2, 11.

476
00:43:42,730 --> 00:43:49,560
Kama nilikuwa tu kufanyika foreach ($ safu kama $ bidhaa) kisha item itakuwa thamani 1

477
00:43:49,560 --> 00:43:54,190
mara ya kwanza kwa njia ya kitanzi. Itakuwa increment 1-2 na kisha sisi ni kosa.

478
00:43:54,190 --> 00:43:57,260
Hivyo basi itakuwa kupitia kupita ya pili ya kitanzi na bidhaa kwamba ni 10.

479
00:43:57,260 --> 00:44:01,570
Ni nyongeza item 11, na kisha hiyo tu kutupwa mbali.

480
00:44:01,570 --> 00:44:06,670
Kisha sisi print_r ($ safu); na hebu angalia kwamba hii ni 1 tu, 10.

481
00:44:06,670 --> 00:44:09,070
Hivyo increment tulifanya waliopotea.

482
00:44:09,070 --> 00:44:13,410
Lakini foreach ($ safu kama & $ bidhaa)

483
00:44:13,410 --> 00:44:21,910
sasa bidhaa hii ni bidhaa hiyo kama haki hii hapa. Ni kitu kimoja.

484
00:44:21,910 --> 00:44:26,820
Hivyo $ item + + ni kubadilisha safu 0.

485
00:44:29,330 --> 00:44:41,850
Kimsingi, unaweza pia kufanya $ k -> $ bidhaa na unaweza kufanya $ safu [$ k] + +;

486
00:44:41,850 --> 00:44:48,650
>> Hivyo njia nyingine ya kufanya hivyo, sisi ni huru ya kurekebisha kipengele,

487
00:44:48,650 --> 00:44:54,070
lakini si kurekebisha safu yetu ya awali.

488
00:44:54,070 --> 00:44:59,720
Lakini kama sisi kutumia k, ambayo ni muhimu yetu, basi tunaweza tu index katika safu yetu ya kutumia ufunguo

489
00:44:59,720 --> 00:45:01,530
na increment kwamba.

490
00:45:01,530 --> 00:45:05,410
Hii zaidi moja kwa moja hugeuza safu yetu ya awali.

491
00:45:05,410 --> 00:45:10,690
Unaweza hata kufanya hivyo kama kwa sababu baadhi ya alitaka uwezo wa kurekebisha -

492
00:45:10,690 --> 00:45:13,510
Kweli, huu ni kikamilifu kuridhisha.

493
00:45:13,510 --> 00:45:16,020
Wewe hakutaka kuwa na kuandika $ safu [$ k] + +,

494
00:45:16,020 --> 00:45:27,890
wewe tu alitaka kuandika $ item + + lakini bado alitaka kusema kama ($ k === 'a')

495
00:45:27,890 --> 00:45:30,620
kisha increment bidhaa na kisha magazeti safu yetu.

496
00:45:30,620 --> 00:45:36,290
Hivyo sasa nini tunatarajia print_r kufanya? Nini maadili lazima kuchapishwa?

497
00:45:36,290 --> 00:45:43,770
[Mwanafunzi] 2 na 10. >> [Bowden] tu ikiwa muhimu ilikuwa 'je sisi kweli kwamba magazeti.

498
00:45:51,940 --> 00:45:55,670
>> Pengine ni kwa nadra sana, kama milele, itakuwa haja ya kufafanua kazi katika PHP,

499
00:45:55,670 --> 00:46:03,370
lakini unaweza kuona kitu sawa ambapo unaweza kufafanua kazi kama chochote kazi.

500
00:46:03,370 --> 00:46:09,900
Kawaida ungependa kusema ($ foo, $ bar) na kisha kufafanua kuwa chochote.

501
00:46:09,900 --> 00:46:17,580
Lakini kama mimi kufanya hivi, basi hiyo ina maana kwamba kila wito chochote,

502
00:46:17,580 --> 00:46:25,110
chochote wito bazi, hivyo hoja ya kwanza kupita kwa bazi inaweza kubadilishwa.

503
00:46:25,110 --> 00:46:38,100
Hebu kufanya $ foo + +;

504
00:46:38,100 --> 00:46:48,020
na ndani ya hapa hebu kufanya bazi ($ item);

505
00:46:48,020 --> 00:46:52,250
Sasa sisi ni wito kazi.

506
00:46:52,250 --> 00:46:56,780
Hoja ni kuchukuliwa kwa kumbukumbu, ambayo ina maana kwamba kama sisi kurekebisha

507
00:46:56,780 --> 00:47:00,390
sisi ni kubadilisha kitu kwamba ilipitishwa in

508
00:47:00,390 --> 00:47:04,420
Na uchapishaji huu tunatarajia - isipokuwa mimi messed up syntax - tulipata 2, 11,

509
00:47:04,420 --> 00:47:06,300
hivyo ilikuwa kweli incremented.

510
00:47:06,300 --> 00:47:08,790
ILANI tunahitaji marejeo katika maeneo 2.

511
00:47:08,790 --> 00:47:13,050
Nini kama alifanya hivyo? Hii ina maana gani?

512
00:47:13,050 --> 00:47:15,810
[Mwanafunzi] Ni yatabadilika. >> Yeah.

513
00:47:15,810 --> 00:47:18,290
Dondoo ni nakala ya thamani katika safu.

514
00:47:18,290 --> 00:47:26,670
Hivyo bidhaa kubadilika na 2, lakini safu ['a'] bado kuwa 1.

515
00:47:26,670 --> 00:47:32,560
Au nini kama mimi kufanya hili?

516
00:47:32,560 --> 00:47:39,260
Sasa bidhaa ni alimtuma kama nakala bazi.

517
00:47:39,260 --> 00:47:46,330
Hivyo nakala ya hoja itakuwa incremented kwa 2,

518
00:47:46,330 --> 00:47:49,240
lakini bidhaa yenyewe ilikuwa kamwe incremented kwa 2.

519
00:47:49,240 --> 00:47:52,880
Na bidhaa ni kitu kimoja kama safu bracket chochote,

520
00:47:52,880 --> 00:47:55,380
hivyo safu kwamba alikuwa kamwe incremented.

521
00:47:55,380 --> 00:47:57,960
Hivyo wote wale maeneo haja yake.

522
00:47:57,960 --> 00:48:03,830
>> PHP ni kawaida pretty smart kuhusu hili.

523
00:48:03,830 --> 00:48:06,570
Unaweza kufikiri nataka kupita kwa kumbukumbu -

524
00:48:06,570 --> 00:48:09,560
Hii ilikuwa kwa kweli ni swali juu ya mmoja wa psets.

525
00:48:09,560 --> 00:48:14,480
Ilikuwa ni jambo questions.txt ambapo alisema,

526
00:48:14,480 --> 00:48:19,280
Kwa nini wapate unataka kupita hii struct kwa kumbukumbu?

527
00:48:19,280 --> 00:48:21,250
Jibu lilikuwa nini kwa hiyo?

528
00:48:21,250 --> 00:48:25,100
[Mwanafunzi] Basi huna nakala jambo kubwa. >> Yeah.

529
00:48:25,100 --> 00:48:32,920
struct inaweza kuwa kubwa kiholela, na wakati kupita katika struct kama hoja

530
00:48:32,920 --> 00:48:36,800
inahitaji kwamba nakala struct nzima kupita kwa kazi,

531
00:48:36,800 --> 00:48:40,410
lakini kama wewe tu kupita kwa rejea struct

532
00:48:40,410 --> 00:48:46,530
basi unahitaji tu nakala anuani 4-Byte kama hoja kwa kazi.

533
00:48:48,520 --> 00:48:52,320
PHP ni kidogo nadhifu zaidi ya hiyo.

534
00:48:52,320 --> 00:49:00,650
Kama mimi na baadhi ya kazi na mimi kupita kwa hiyo safu ya mambo 1000,

535
00:49:00,650 --> 00:49:03,990
haina maana kwamba ni kwenda kuwa na nakala zote 1,000 wa mambo hayo

536
00:49:03,990 --> 00:49:10,450
kupita ndani ya kazi? Haina kufanya hivyo mara moja.

537
00:49:10,450 --> 00:49:15,940
Kama ndani ya kazi hii ni kweli kamwe hugeuza foo,

538
00:49:15,940 --> 00:49:22,660
hivyo kama ($ foo === 'hujambo') kurudi kweli.;

539
00:49:22,660 --> 00:49:26,460
Angalia sisi kamwe kweli iliyopita ndani ya hoja ya kazi hii,

540
00:49:26,460 --> 00:49:30,010
ambayo ina maana kwamba kila ilipitishwa katika kama foo kamwe mahitaji kunakiliwa

541
00:49:30,010 --> 00:49:32,100
sababu ni si kubadilisha hilo.

542
00:49:32,100 --> 00:49:39,240
Hivyo njia PHP matendo ni hoja ni daima kupita kwa kumbukumbu

543
00:49:39,240 --> 00:49:42,170
mpaka kweli kujaribu kurekebisha.

544
00:49:42,170 --> 00:49:51,160
Sasa kama mimi kusema $ foo + +, ni sasa kufanya nakala ya awali ya foo na kurekebisha nakala.

545
00:49:51,160 --> 00:49:53,090
Hii anaokoa muda.

546
00:49:53,090 --> 00:49:58,210
Kama wewe ni kamwe kugusa hii safu mkubwa, wewe kamwe kweli kurekebisha,

547
00:49:58,210 --> 00:50:02,360
haina haja ya kufanya nakala,

548
00:50:02,360 --> 00:50:06,640
lakini kama sisi tu ya kuweka hii ampersand kwamba maana haina hata nakala yake

549
00:50:06,640 --> 00:50:08,640
hata kama huna kurekebisha.

550
00:50:08,640 --> 00:50:10,680
Tabia hii inaitwa nakala-on-andika.

551
00:50:10,680 --> 00:50:17,380
Utaona katika maeneo mengine, hasa kama wewe kuchukua mfumo wa uendeshaji shaka.

552
00:50:17,380 --> 00:50:23,880
Copy-on-kuandika ni mfano pretty kawaida ambapo huna haja ya kufanya nakala ya kitu

553
00:50:23,880 --> 00:50:26,650
isipokuwa ni hasa kubadilisha. Yeah.

554
00:50:26,650 --> 00:50:29,520
[Mwanafunzi] Nini kama alikuwa na increment ndani ya mtihani,

555
00:50:29,520 --> 00:50:33,700
hivyo tu 1 kipengele nje ya 1000 bila haja ya kuwa iliyopita?

556
00:50:33,700 --> 00:50:38,770
Mimi nina uhakika.

557
00:50:38,770 --> 00:50:51,250
Nadhani ingekuwa nakala jambo nzima, lakini inawezekana ni smart kutosha kwamba -

558
00:50:51,250 --> 00:51:00,020
Kweli, kile Mimi nina mawazo ni kufikiria tulikuwa safu kwamba inaonekana kama hii: $ array2 = [

559
00:51:00,020 --> 00:51:11,000
Kisha index '' ni safu ya [1 2 3 4], na index 'b' ni safu ya chochote.

560
00:51:11,000 --> 00:51:15,380
Nahitaji koma kati ya wale wote. Fikiria kuna koma.

561
00:51:15,380 --> 00:51:21,210
Kisha 'c' ni 3 thamani.

562
00:51:24,210 --> 00:51:26,290
Sawa.

563
00:51:26,290 --> 00:51:33,440
Sasa hebu sema sisi kufanya $ bazi ($ array2);

564
00:51:33,440 --> 00:51:36,540
ambapo bazi haina kuchukua hii kwa kumbukumbu.

565
00:51:43,510 --> 00:51:47,370
Hivyo $ foo ['c'] + +;

566
00:51:47,370 --> 00:51:52,340
Huu ni mfano vile ambapo sisi ni kupita array2 kama hoja

567
00:51:52,340 --> 00:51:57,010
na kisha ni kubadilisha index maalum ya safu na incrementing yake.

568
00:51:57,010 --> 00:52:01,090
Mimi uaminifu hawana wazo nini PHP ni kwenda kufanya.

569
00:52:01,090 --> 00:52:07,200
Ni urahisi kutengeneza nakala ya jambo nzima, lakini kama ni smart,

570
00:52:07,200 --> 00:52:15,030
itafanya nakala ya funguo hizi ambapo hii itakuwa na thamani yake tofauti

571
00:52:15,030 --> 00:52:20,620
lakini hii bado anaweza kumweka kwa safu moja 1,2,3,4

572
00:52:20,620 --> 00:52:22,320
na hii bado anaweza kumweka kwa safu moja.

573
00:52:22,320 --> 00:52:24,170
Mimi itabidi iPad yake.

574
00:52:28,900 --> 00:52:45,950
Sisi kupita katika safu hii ambapo guy hii pointi 3, pointi hii guy [1,2,3,4],

575
00:52:45,950 --> 00:52:51,350
guy hii pointi [34, ...]

576
00:52:51,350 --> 00:52:58,590
Sasa kwa kuwa tuko kupita kuifanya katika bazi, sisi ni kubadilisha huu.

577
00:52:58,590 --> 00:53:03,550
Kama PHP ni smart, inaweza tu kufanya -

578
00:53:11,850 --> 00:53:18,230
Sisi bado alikuwa na nakala baadhi ya kumbukumbu, lakini kama kulikuwa na hizi kubwa subarrays nested

579
00:53:18,230 --> 00:53:21,560
sisi hakuwa na haja ya nakala hizo.

580
00:53:21,560 --> 00:53:27,530
Sijui kama kwamba ni nini hivyo, lakini siwezi kufikiria kufanya hivyo.

581
00:53:29,050 --> 00:53:36,690
Hii pia ni faida kubwa ya pretty C zaidi PHP.

582
00:53:36,690 --> 00:53:40,320
>> PHP hufanya maisha rahisi sana kwa mambo mengi,

583
00:53:40,320 --> 00:53:45,060
lakini wewe aina ya kuwa na kabisa hakuna wazo jinsi vizuri kufanya mapenzi

584
00:53:45,060 --> 00:53:52,530
kwa sababu mimi sielewi chini ya Hood wakati ni kutengeneza nakala hii ya mambo,

585
00:53:52,530 --> 00:53:55,170
oh, ni kwamba anaenda kuwa mara kwa mara wakati nakala,

586
00:53:55,170 --> 00:54:01,140
ni tu kwenda na mabadiliko 1 pointer, ni kwenda kuwa ridiculously vigumu linear nakala?

587
00:54:01,140 --> 00:54:03,000
Nini kama hawezi kupata nafasi?

588
00:54:03,000 --> 00:54:06,760
Je, ni basi haja ya kuendesha ukusanyaji takataka ili kupata baadhi ya nafasi zaidi?

589
00:54:06,760 --> 00:54:11,210
Na ukusanyaji takataka inaweza kuchukua muda mrefu kiholela.

590
00:54:11,210 --> 00:54:13,600
Katika C huna na wasiwasi juu ya mambo haya.

591
00:54:13,600 --> 00:54:19,780
Kila line moja ya kuandika unaweza pretty much sababu kuhusu jinsi itakavyo kufanya.

592
00:54:26,800 --> 00:54:29,150
>> Hebu kuangalia nyuma katika haya.

593
00:54:35,400 --> 00:54:37,520
Jinsi nice ni kwamba huna kukabiliana na majukumu hash,

594
00:54:37,520 --> 00:54:39,010
wanaohusishwa orodha, au jambo kama hilo?

595
00:54:39,010 --> 00:54:41,980
Tangu kufanya kazi kwa meza hash ni rahisi sasa, hapa puzzle fun kufanya kazi.

596
00:54:41,980 --> 00:54:45,920
Kufungua faili inayoitwa unique.php na ndani yake kuandika mpango PHP

597
00:54:45,920 --> 00:54:48,330
(Pia inajulikana kama "script").

598
00:54:48,330 --> 00:54:55,700
Sisi huwa na kuwaita scripts kama uko mfupi mambo ambayo wewe kukimbia katika mstari amri.

599
00:54:55,700 --> 00:55:02,950
Kimsingi, lugha yoyote kwamba huwezi kukusanya lakini wewe ni kwenda kukimbia executable

600
00:55:02,950 --> 00:55:05,920
katika mstari amri, unaweza wito kwamba script kutekelezwa.

601
00:55:05,920 --> 00:55:08,510
Mimi nilikuwa tu kama vile kuandika mpango C kwamba gani hii,

602
00:55:08,510 --> 00:55:12,300
lakini mimi si kuiita script tangu mimi kwanza kukusanya yake na kisha kukimbia binary.

603
00:55:12,300 --> 00:55:15,480
Lakini mpango huu PHP tunakwenda kuwaita script.

604
00:55:15,480 --> 00:55:23,830
Au kama sisi aliandika katika Python au Perl au Node.js au yeyote mambo hayo,

605
00:55:23,830 --> 00:55:26,500
tunatarajia kuwaita wote scripts kwa sababu wewe kukimbia nao katika mstari amri

606
00:55:26,500 --> 00:55:30,040
lakini hatuwezi kukusanya yao.

607
00:55:30,860 --> 00:55:33,400
Tunaweza kufanya hili pretty haraka.

608
00:55:36,960 --> 00:55:41,480
Sisi si kwenda kutumia argv. Hebu tu pigo kwa njia hii.

609
00:55:41,480 --> 00:55:45,730
Simu yake ya kipekee, kuandika mpango.

610
00:55:45,730 --> 00:55:49,400
Unaweza kudhani kwamba pembejeo yana neno moja kwa kila mstari.

611
00:55:49,400 --> 00:55:52,020
Kweli, argv itakuwa pretty yasiyo na maana na matumizi.

612
00:56:03,730 --> 00:56:06,720
unique.php.

613
00:56:08,550 --> 00:56:13,750
Jambo la kwanza kwanza, tunataka kuangalia kama sisi wamekuwa kupita 1 amri-line hoja.

614
00:56:13,750 --> 00:56:20,900
Just kama ungependa kutarajia argc na argv katika C, bado tuna wale katika PHP.

615
00:56:20,900 --> 00:56:33,900
Hivyo kama ($ 2 argc ==!) Basi mimi si kukabiliana na uchapishaji ujumbe au kitu chochote.

616
00:56:33,900 --> 00:56:37,340
Mimi itabidi exit, kosa code ya 1.

617
00:56:37,340 --> 00:56:41,340
Mimi naweza pia kurejea 1.

618
00:56:41,340 --> 00:56:53,180
Mara chache katika PHP ni wewe katika hali hii ambapo sisi ni saa -

619
00:56:53,180 --> 00:56:57,820
Kawaida uko katika kazi kuitwa na kazi kuitwa na kazi kuitwa na kazi.

620
00:56:57,820 --> 00:57:02,070
Na kama kitu fulani kitaenda vibaya na wewe tu unataka kutoka kila kitu kabisa,

621
00:57:02,070 --> 00:57:05,680
exit tu mwisho wa mpango.

622
00:57:05,680 --> 00:57:08,160
Hii pia lipo katika C.

623
00:57:08,160 --> 00:57:10,700
Kama uko katika kazi katika kazi katika kazi katika kazi

624
00:57:10,700 --> 00:57:17,540
na unataka kuua tu mpango, unaweza kupiga exit na itakuwa tu exit.

625
00:57:17,540 --> 00:57:23,120
Lakini katika PHP ni zaidi nadra kuwa sisi ni katika ngazi hii ya juu.

626
00:57:23,120 --> 00:57:26,090
Kawaida tuko ndani ya baadhi ya aina ya kazi, hivyo sisi kuwaita exit

627
00:57:26,090 --> 00:57:29,650
hivyo kwamba hatuna kurudi up 1 jambo basi anatambua kuna kosa

628
00:57:29,650 --> 00:57:32,270
hivyo kwamba anarudi juu kama kwamba inatambua kulikuwa na hitilafu.

629
00:57:32,270 --> 00:57:35,270
Hatutaki kukabiliana na kwamba, hivyo exit (1);

630
00:57:35,270 --> 00:57:38,240
kurudi (1), katika kesi hii itakuwa sawa.

631
00:57:38,240 --> 00:57:44,000
>> Kisha ni nini tunataka kufungua tunataka fopen.

632
00:57:44,000 --> 00:57:46,760
hoja ni kwenda kuangalia pretty sawa.

633
00:57:46,760 --> 00:57:51,600
Tunataka fopen ($ argv [1], na tunataka kufungua kwa kusoma.

634
00:57:51,600 --> 00:57:55,720
Hiyo anarudi rasilimali ambayo sisi ni kwenda kuwaita f.

635
00:57:55,720 --> 00:58:02,180
Hii inaonekana pretty sawa na jinsi C gani ila hatuna kusema JALADA *.

636
00:58:02,180 --> 00:58:06,170
Badala yake sisi tu kusema $ f. Sawa.

637
00:58:06,170 --> 00:58:17,190
Kweli, nadhani hata hii inatupa ladha kama kwa PHP kazi kuitwa faili. PHP File.

638
00:58:17,190 --> 00:58:23,990
Nini hii ni kwenda kufanya ni kusoma faili nzima katika safu.

639
00:58:23,990 --> 00:58:29,770
Huna hata haja ya fopen yake. Ni kwenda kufanya hivyo kwa ajili yenu.

640
00:58:37,450 --> 00:58:43,700
Hivyo $ mistari = faili ($ argv [1]);

641
00:58:43,700 --> 00:58:49,680
Sasa yote ya mistari ya faili ni katika mistari. Sasa tunataka kutatua mistari.

642
00:58:49,680 --> 00:58:52,180
Tunawezaje kutatua mistari?

643
00:58:52,180 --> 00:58:54,920
Sisi aina mistari.

644
00:58:54,920 --> 00:58:58,080
Na sasa tunaweza magazeti yao au chochote.

645
00:58:58,080 --> 00:59:05,580
Pengine njia rahisi ni foreach ($ mistari kama $ line) echo $ kamba;

646
00:59:05,580 --> 00:59:10,960
[Mwanafunzi] Je, si sisi hata kuvuka mistari na referencing kitu katika aina?

647
00:59:10,960 --> 00:59:28,850
Hii ni pale ambapo aina itakuwa hufafanuliwa kama kazi ya aina (& $ safu).

648
00:59:28,850 --> 00:59:32,650
Wakati wewe piga kazi huna kupita kwa kumbukumbu.

649
00:59:32,650 --> 00:59:36,900
Ni kazi ambayo amefafanua ni kama kuchukua ni kama kumbukumbu.

650
00:59:36,900 --> 00:59:40,900
Hii ni kweli hasa ni nini potoka

651
00:59:40,900 --> 00:59:46,220
wakati sisi kuweka kila kitu kwa server yetu wakati sisi akaenda 5.3-5.4.

652
00:59:46,220 --> 00:59:53,800
Hadi 5.4, hii ilikuwa kikamilifu kuridhisha.

653
00:59:53,800 --> 00:59:58,740
kazi hatarajii kuchukua kama rejea, lakini unaweza kupita kama rejea

654
00:59:58,740 --> 01:00:02,860
hivyo kama kazi haina kutokea kwa kurekebisha, ni bado iliyopita.

655
01:00:02,860 --> 01:00:05,850
Kama ya 5.4, wewe si zinatakiwa kufanya hii.

656
01:00:05,850 --> 01:00:11,740
Hivyo sasa njia pekee ya kupita kwa kumbukumbu ni kama kazi waziwazi hufanya.

657
01:00:11,740 --> 01:00:19,840
Kama hutaki ni kurekebisha, basi unahitaji kufanya $ nakala = $ mistari na nakala kupita.

658
01:00:19,840 --> 01:00:24,820
Hivyo sasa mistari itahifadhiwa na nakala tutageuzwa.

659
01:00:27,670 --> 01:00:31,460
php.unique.php. Nipate messed up kitu.

660
01:00:31,460 --> 01:00:33,190
Zisizotarajiwa 'aina'.

661
01:00:38,320 --> 01:00:43,850
Itakuja kuwa kitu ambacho gani hii kwa ajili yetu.

662
01:00:43,850 --> 01:00:45,820
Si hata huko.

663
01:00:45,820 --> 01:00:52,140
Angalia wakati wewe kusoma mwongozo kwamba hoja ya kwanza inatarajiwa kuwa safu

664
01:00:52,140 --> 01:00:56,490
na ni kuchukuliwa kwa kumbukumbu.

665
01:00:58,160 --> 01:01:03,540
Kwa nini hii kulalamika kwangu? Kwa sababu mimi na aina hii ya kazi bado katika hapa kwamba sitaki.

666
01:01:03,540 --> 01:01:09,210
Okay, php.unique.php. Sikuweza kupita hoja kwa sababu sina faili.

667
01:01:09,210 --> 01:01:13,560
Ni juu ya php.unique.php test.php.

668
01:01:13,560 --> 01:01:19,080
Hapa ni test.php wote kuchapishwa ili nzuri Iliyopangwa.

669
01:01:19,080 --> 01:01:24,600
Ona kwamba sorted ili ni aina ya weird kwa faili code

670
01:01:24,600 --> 01:01:27,460
kwa sababu wote wa mistari yetu tupu yatakuja kwanza

671
01:01:27,460 --> 01:01:30,190
basi yatakuja yote ya 1 indentations ngazi wetu

672
01:01:30,190 --> 01:01:33,360
kisha kuja wote wa indentations yetu hakuna.

673
01:01:33,360 --> 01:01:38,620
Yeah. >> [Mwanafunzi] Basi kwa chanzo code haikuwa kupita kwa kumbukumbu?

674
01:01:38,620 --> 01:01:42,240
Ni kwamba kwa ujumla wanapita thamani?

675
01:01:42,240 --> 01:01:50,240
[Bowden] Wakati wewe piga kazi, kamwe huamua kama ni ilipitishwa na kumbukumbu.

676
01:01:50,240 --> 01:01:53,960
Ni ufafanuzi kazi ambayo huamua kama ni ilipitishwa na kumbukumbu.

677
01:01:53,960 --> 01:01:59,450
Na kuangalia ufafanuzi kazi ya aina au kuangalia tu hii,

678
01:01:59,450 --> 01:02:02,820
inachukua hoja kwa kumbukumbu.

679
01:02:02,820 --> 01:02:07,160
Hivyo bila kujali kama wewe unataka kuchukua ni kwa kumbukumbu, ni gani kuchukua kwa kumbukumbu.

680
01:02:07,160 --> 01:02:10,200
Ni hugeuza safu katika mahali.

681
01:02:10,200 --> 01:02:17,400
Hii si tu kuruhusiwa. Huna ruhusa ya kufanya hivyo. >> [Mwanafunzi] Oh, okay.

682
01:02:17,400 --> 01:02:22,410
[Bowden] Hii, aina ni kwenda kuchukua mistari ukihusishwa na kurekebisha.

683
01:02:22,410 --> 01:02:26,850
Na tena, kama hakutaka kufanya hivyo, unaweza kufanya nakala ya aina.

684
01:02:26,850 --> 01:02:35,850
Hata katika kesi hii, nakala ni kweli si nakala ya mistari.

685
01:02:35,850 --> 01:02:40,620
Ni tu anazungumzia kitu hivyo mpaka kwanza anapata iliyopita,

686
01:02:40,620 --> 01:02:44,430
ambapo ni kwanza kwenda kupata iliyopita katika kazi ya aina,

687
01:02:44,430 --> 01:02:50,940
ambapo, kwa sababu ni nakala-on-kuandika, sasa nakala ya nakala inaenda kufanywa.

688
01:02:57,500 --> 01:03:04,250
Unaweza pia kufanya hili. Hiyo ni sehemu nyingine unaweza kuona ampersand.

689
01:03:04,250 --> 01:03:07,190
Unaweza kuona ni katika matanzi foreach, unaweza kuona ni katika maazimio ya kazi,

690
01:03:07,190 --> 01:03:10,040
na unaweza kuona ni wakati tu assigning vigezo.

691
01:03:10,040 --> 01:03:12,350
Sasa sisi kuwa yametimia chochote kwa kufanya hivi

692
01:03:12,350 --> 01:03:15,600
kwa sababu nakala na mistari ni literally kitu kimoja.

693
01:03:15,600 --> 01:03:19,940
Unaweza kutumia mistari na nakala ya kubadilishana.

694
01:03:19,940 --> 01:03:25,430
Unaweza kufanya unset ($ nakala), na kwamba haina mistari unset,

695
01:03:25,430 --> 01:03:29,120
wewe tu kupoteza kumbukumbu yako kwa kitu kimoja.

696
01:03:29,120 --> 01:03:33,440
Hivyo kama ya hatua hii, sasa mistari ni njia pekee unaweza kupata mistari.

697
01:03:36,450 --> 01:03:38,770
>> Maswali?

698
01:03:41,000 --> 01:03:42,460
Yeah.

699
01:03:42,460 --> 01:03:45,880
[Mwanafunzi] Kabisa off topic, lakini huna kuifunga PHP na - >> Wewe hawana.

700
01:03:45,880 --> 01:03:47,730
Sawa.

701
01:03:47,730 --> 01:03:53,790
[Bowden] napenda kwenda mbali kama kusema ni mbaya mazoezi kwa karibu yao.

702
01:03:53,790 --> 01:03:57,580
Kwamba pengine exaggeration, hasa katika script,

703
01:03:57,580 --> 01:04:03,740
lakini hebu angalia nini kinatokea kama mimi kufanya hili.

704
01:04:03,740 --> 01:04:08,890
Kwamba alifanya kitu. Nini kama alitaka - [sighs]

705
01:04:13,870 --> 01:04:16,960
Mimi haja ya kupita hoja.

706
01:04:19,000 --> 01:04:22,050
Risasi. Mimi kuitwa ni makosa.

707
01:04:24,340 --> 01:04:28,310
Hivyo php.unique.php na hoja.

708
01:04:28,310 --> 01:04:30,980
Sasa mimi si hata haja hii.

709
01:04:34,520 --> 01:04:37,740
Mimi itabidi kupita hoja halali.

710
01:04:37,740 --> 01:04:42,050
Hii printed chochote ni uchapishaji.

711
01:04:45,260 --> 01:04:50,080
Mimi nina kuchapa nakala na nakala haipo. Hivyo mistari.

712
01:04:53,650 --> 01:04:58,270
Ni kuchapishwa kila kitu, na kisha taarifa Junk hii yote chini hapa,

713
01:04:58,270 --> 01:05:06,690
kwa sababu katika kitu chochote PHP kwamba ni nje ya tags PHP

714
01:05:06,690 --> 01:05:09,520
ni kwenda tu kuchapishwa literally.

715
01:05:09,520 --> 01:05:18,050
Hiyo ndiyo sababu HTML, ni hivyo nice kwamba naweza kufanya div blah, blah, blah darasa au chochote,

716
01:05:18,050 --> 01:05:25,140
blah, blah, blah na kisha kufanya baadhi ya kanuni PHP na kisha kufanya mwisho div.

717
01:05:25,140 --> 01:05:36,460
Na sasa uchapishaji hii mimi kupata div yangu nzuri juu juu, kila kitu PHP kuchapishwa, div chini.

718
01:05:36,460 --> 01:05:43,510
Maafa wakati kitu kama hii kinatokea, ambayo ni pretty kawaida,

719
01:05:43,510 --> 01:05:47,930
tu newline kupotea chini ya faili.

720
01:05:47,930 --> 01:05:50,940
Wewe bila kufikiri itakuwa kuwa kubwa ya mpango huo

721
01:05:50,940 --> 01:05:58,660
mpaka kuzingatia ukweli kwamba pamoja na browsers -

722
01:05:58,660 --> 01:06:03,880
>> Jinsi redirects kazi au kimsingi kazi yoyote headers,

723
01:06:03,880 --> 01:06:07,980
wakati wa kufanya uhusiano wako na tovuti na inapeleka nyuma wote hawa headers na mambo

724
01:06:07,980 --> 01:06:12,020
kama majibu 200 au majibu redirect au chochote,

725
01:06:12,020 --> 01:06:18,230
headers ni halali tu mpaka Byte kwanza ya data ni alimtuma.

726
01:06:18,230 --> 01:06:23,140
Unaweza kuelekeza maelfu ya nyakati, lakini haraka kama Byte kwanza ya data ni alimtuma

727
01:06:23,140 --> 01:06:26,120
wewe si walidhani redirect tena.

728
01:06:26,120 --> 01:06:31,860
>> Kama una newline kupotea chini ya faili

729
01:06:31,860 --> 01:06:37,260
na hebu kusema kwamba matumizi ya kazi hii na kisha unataka -

730
01:06:41,580 --> 01:06:52,870
Hebu kusema ni faili nyingine kwamba index.php na wewe require_once kitu -

731
01:06:52,870 --> 01:06:56,920
Siwezi kufikiria mfano mzuri wa hayo.

732
01:06:56,920 --> 01:07:04,740
suala kinachotokea wakati mstari huu chini anapata aliunga.

733
01:07:04,740 --> 01:07:08,660
Hutaki chochote zimerejewa bado.

734
01:07:10,820 --> 01:07:15,700
Hata kama wewe hakuwa na nia ya juu ya kitu chochote kupata aliunga, kitu gani kupata aliunga

735
01:07:15,700 --> 01:07:17,990
na hivyo sasa wewe si walidhani kutuma headers yoyote zaidi

736
01:07:17,990 --> 01:07:20,030
na wewe ni kwenda kupata malalamiko.

737
01:07:22,170 --> 01:07:24,420
Wewe tu hawana haja tags wale kufunga.

738
01:07:24,420 --> 01:07:27,420
Kama mpango juu ya kufanya kitu kwa HTML -

739
01:07:27,420 --> 01:07:30,490
na ni kikamilifu busara kufanya chini hapa div chochote

740
01:07:30,490 --> 01:07:39,450
na kisha katika hatua hii unaweza au huwezi pamoja nao.

741
01:07:39,450 --> 01:07:41,590
Ni kweli haina jambo.

742
01:07:41,590 --> 01:07:45,450
Lakini katika maandiko ya PHP ni nadra kwa kulifunga.

743
01:07:45,450 --> 01:07:50,400
Wakati kila kitu ni PHP, kabisa kila kitu,

744
01:07:50,400 --> 01:07:55,460
wewe si kweli wanahitaji kuifunga / unapaswa kulifunga.

745
01:08:02,030 --> 01:08:05,720
>> Kushughulika na masharti ni nicer kuliko katika C.

746
01:08:05,720 --> 01:08:09,470
Katika PHP unaweza specify string kwa quotes moja au mbili.

747
01:08:09,470 --> 01:08:12,820
Pamoja na quotes moja huwezi kutumia "kutoroka" Mwandamano.

748
01:08:12,820 --> 01:08:17,640
Daima kutoroka, blah, blah, blah.

749
01:08:19,920 --> 01:08:24,010
Hivyo printf ni nadra sana katika PHP.

750
01:08:24,010 --> 01:08:32,290
Mimi nadhani ingekuwa kutumia printf ikiwa mimi alitaka kufanya aina ya kitu - katika pset 5 wewe kutumika sprintf au chochote.

751
01:08:32,290 --> 01:08:36,060
Lakini unataka kufanya 001.jpg na 002.jpg.

752
01:08:36,060 --> 01:08:40,300
Hivyo kwa kuwa aina ya kitu ambapo mimi kweli wanataka formatting Nakala napenda kutumia printf.

753
01:08:40,300 --> 01:08:44,689
Lakini vinginevyo mimi ingekuwa tu kutumia kamba concatenation.

754
01:08:44,689 --> 01:08:47,000
Mimi kamwe kweli kutumia printf.

755
01:08:49,229 --> 01:09:00,170
Sisi ni tu kutofautisha kati ya maelezo quotes moja na quotes mbili.

756
01:09:00,170 --> 01:09:07,490
tofauti kubwa ni kwamba enda quotes, itakuwa kuchapishwa literally.

757
01:09:07,490 --> 01:09:15,390
Hakuna data Char aina katika PHP, tofauti na C, hivyo hii ni sawa na hii.

758
01:09:15,390 --> 01:09:17,970
Wao ni wote masharti.

759
01:09:17,970 --> 01:09:29,180
Na kitu kizuri kuhusu masharti moja quote ni mimi naweza kusema 'hujambo dunia!' blah, blah, blah,

760
01:09:29,180 --> 01:09:33,340
$ $ Wooo.

761
01:09:33,340 --> 01:09:38,260
Nini kinatokea wakati mimi magazeti hii itakuwa ni magazeti yake halisi.

762
01:09:38,260 --> 01:09:40,680
Hebu kujikwamua yote ya mambo yetu.

763
01:09:40,680 --> 01:09:44,700
Hivyo echo $ str1;

764
01:09:48,569 --> 01:09:56,570
Ni literally printed wote wa mambo hayo: dola ishara,

765
01:09:56,570 --> 01:09:58,770
backslash n, ambayo unaweza kudhani itakuwa newlines -

766
01:09:58,770 --> 01:10:01,500
wote wa mambo hayo ni Prints literally.

767
01:10:01,500 --> 01:10:05,650
Kitu tu unahitaji kutoroka ni moja quotes

768
01:10:05,650 --> 01:10:09,470
kwa sababu vinginevyo kudhani ni kufunga quotes moja.

769
01:10:09,470 --> 01:10:15,050
Double quotes, tofauti kabisa.

770
01:10:20,300 --> 01:10:25,870
Sisi tayari kuona syntax mwangaza ni cluing sisi juu ya nini kuhusu kwenda vibaya sana.

771
01:10:25,870 --> 01:10:36,190
php.unique. Undefined variable: wooo kwa sababu hii ni kufasiriwa kama variable kuitwa wooo.

772
01:10:36,190 --> 01:10:42,400
Quotes Double basi wewe Insert vigezo katika -

773
01:10:42,400 --> 01:10:52,730
Hebu sema $ jina = "Rob";

774
01:10:52,730 --> 01:10:58,020
Hivyo echo "Hi, jina langu ni $ jina!";

775
01:10:58,020 --> 01:11:09,260
Ni inatambua hii kama variable.

776
01:11:09,260 --> 01:11:21,210
Wakati mimi kukimbia kwamba - Nami Insert newline - Hi, jina langu ni Rob! na hujambo ulimwengu!

777
01:11:21,210 --> 01:11:24,910
Hii ni kwa sababu mimi kamwe kuondolewa uchapishaji wa wooo hapo juu.

778
01:11:24,910 --> 01:11:30,020
Kuna 1 zaidi hatua unaweza kufanya.

779
01:11:30,020 --> 01:11:39,250
$ Safu = [1, 2, 3];

780
01:11:39,250 --> 01:11:43,270
Nini kama nataka magazeti index ya kwanza ya safu?

781
01:11:43,270 --> 01:11:45,150
Unaweza kufanya $ safu [0].

782
01:11:45,150 --> 01:11:49,280
syntax mwangaza ni kidokezo. Nini hii kwenda kufanya?

783
01:11:52,320 --> 01:11:54,510
php.unique.

784
01:11:54,510 --> 01:11:59,860
Hi, jina langu ni 1! ambayo si nini nilitaka.

785
01:11:59,860 --> 01:12:05,050
Syntax mwangaza alisema uongo kwangu.

786
01:12:05,050 --> 01:12:13,020
Hebu jaribu '' -> 1, 'b' -> 2.

787
01:12:18,450 --> 01:12:21,440
Hayo ni jinsi mimi ingekuwa kuandika.

788
01:12:26,350 --> 01:12:32,160
Zisizotarajiwa moja quote (T_ENCAPSED blah, blah, blah, blah, blah).

789
01:12:32,160 --> 01:12:41,780
Wazo ni kwamba siyo kutambua hili kama sehemu ya safu.

790
01:12:41,780 --> 01:12:46,620
Siyo akitambua hili kama safu indexed na barua.

791
01:12:46,620 --> 01:12:49,870
Wewe unataka kufanya hivyo kuzungukwa na braces curly,

792
01:12:49,870 --> 01:12:54,730
na sasa chochote ni katika hii brace curly itakuwa interpolated,

793
01:12:54,730 --> 01:13:00,340
ambayo ni neno sisi kutumia kwa ajili ya kuingiza vigezo magically hizi katika maeneo ya kulia.

794
01:13:00,340 --> 01:13:04,280
Sasa kufanya hivyo, php.unique, na Hi, jina langu ni 1! kama ilivyotarajiwa

795
01:13:04,280 --> 01:13:07,720
au Hi, jina langu ni Rob!

796
01:13:14,110 --> 01:13:23,130
Jambo moja kwamba ni aina ya nice kuhusu quotes moja ni kwamba -

797
01:13:23,130 --> 01:13:28,480
Kuna baadhi ya gharama kwa interpolating.

798
01:13:30,520 --> 01:13:35,100
Kama matumizi ya quotes mbili, mkalimani ina kwenda juu ya hii kamba,

799
01:13:35,100 --> 01:13:41,500
kuhakikisha kwamba, "Oh, hapa variable Sasa mimi haja ya kwenda kupata kwamba kutofautiana na kuingiza hapa.".

800
01:13:41,500 --> 01:13:48,930
Hata kama wewe si kutumia vigezo yoyote,

801
01:13:48,930 --> 01:13:52,220
kitu ndani ya hizi quotes mbili inahitaji interpolated,

802
01:13:52,220 --> 01:13:56,800
lakini bado itakuwa polepole kwa sababu ya mahitaji ya kwenda juu ya quotes mbili

803
01:13:56,800 --> 01:14:00,130
kuangalia mambo ambayo yanahitaji interpolated.

804
01:14:00,130 --> 01:14:05,360
Hivyo moja quotes inaweza kuwa kidogo kwa kasi kama hakuna mahitaji ya kuwa interpolated,

805
01:14:05,360 --> 01:14:15,650
na mimi huwa hata kutumia quotes moja kwa ajili ya, 'Hi, jina langu ni'. $ Safu ['a'] anyway.

806
01:14:15,650 --> 01:14:20,430
Hiyo itakuwa sawa na kile sisi alikuwa mbele.

807
01:14:24,840 --> 01:14:28,440
Lakini ni suala la upendeleo.

808
01:14:28,440 --> 01:14:34,750
Kama unatumia PHP, pengine hawajali kuhusu tofauti kasi.

809
01:14:34,750 --> 01:14:39,480
Kuna si ya kutosha kufikiri yao nje kwa kuanzia.

810
01:14:39,480 --> 01:14:43,030
>> Maswali yoyote ya mwisho?

811
01:14:47,430 --> 01:14:51,710
>> Sisi kwa kweli hakuwa na hata kupata njia yake yote, lakini mambo haya alikuwa boring.

812
01:14:51,710 --> 01:14:59,080
Jambo la mwisho kwamba aina ya nice katika PHP ni wakati wewe ni kushughulika na HTML,

813
01:14:59,080 --> 01:15:06,450
utasikia kutumia ni kidogo, hivyo nice syntax mkato kwa kuchapa kutofautiana.

814
01:15:32,400 --> 01:15:36,730
Bila kuweka PHP hapa, hii inaitwa mfupi tags.

815
01:15:36,730 --> 01:15:44,330
Rasmi kama ya PHP 5.4, hii imepungua thamani.

816
01:15:44,330 --> 01:15:48,640
Wewe ni ilipendekeza kuweka php.

817
01:15:48,640 --> 01:15:55,770
Hii bado mkono, vitambulisho hivyo fupi na <=? Ni bado kikamilifu faini.

818
01:15:55,770 --> 01:16:02,480
Ni kwa default mkono, hivyo unaweza kutumia hizi kama unataka, na wao ni pretty rahisi.

819
01:16:02,480 --> 01:16:05,700
>> Maswali yoyote?

820
01:16:07,780 --> 01:16:09,270
Wote haki.

821
01:16:10,840 --> 01:16:13,800
>> Kaa classy, ​​San Diego.

822
01:16:13,800 --> 01:16:16,070
[Chuckles]

823
01:16:18,620 --> 01:16:22,660
Bye. [Atacheka]

824
01:16:24,350 --> 01:16:28,470
[Applause] [atacheka]

825
01:22:46,460 --> 01:22:49,460
>> [CS50.TV]