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>> SPEAKER: Let's improve upon the website
that I'm making for freshman,

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via which they can register for
intramural sports in two ways, one

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aesthetically, and two, functionally.

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In particular, let's take a look at
this source in froshims-1.php.

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Notice that the only changes I've made
right now are to change the action of

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this form to register-1.php, and to
add in this line here, a link tag

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whose href is the path to a file
called bootstrap.min.css.

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It turns out that bootstrap is simply
a library for CSS that makes it much

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easier to make prettier websites than
you might otherwise get by default.

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>> Let's now take a look
at register-1.php.

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Atop this file, notice that I've
added this "if" construct.

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If the value of name inside of the POST
superglobal is empty, or if the

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value of gender inside of the POST
superglobal is empty, or if the value

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of dorm inside of the POST superglobal
is empty, then I'm executing a

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function called header.

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But specifically, I'm sending via this
function an HTTP header called

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location after whose colon is
the URL to which I'd like to

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redirect the user.

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Then I immediately call exist because,
if I intend to redirect the user to

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some other URL, I don't want any
additional code, or even HTML, in this

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file, to be sent ultimately
to the user.

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>> Let's now take a look in a browser.

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Notice first, already, that this form
is much prettier than my previous

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version, all thanks to bootstrap.

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Let's now proceed to fill out this form,
but incompletely, so that we can

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trigger that "if" block to actually
redirect me back to froshims-1.

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>> Let's go ahead and provide
my name as intended.

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Sure, I'll be a captain.

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I'll specify myself as male.

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But I'll lazily forget to actually
provide my dorm.

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Let's now click Register.

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>> Now notice I've immediately been
redirected back to this form.

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But that's exactly as we intended.

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Recall, after all, that in
register-1.php, if any of name or

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gender or dorm are empty, that is the
user failed to provide a non-empty

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value, then we would indeed redirect
the user back to that same URL for

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froshims-1.php.

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Only if a user his or her name and
gender and dorm will they be allowed

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to actually register.

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