Page 459 - Beginning PHP 5.3

Chapter 14: Manipulating MySQL Data with PHP

The page URL is retrieved from the “ PHP_SELF ” element in the $_SERVER superglobal array:
“pageUrl” = > basename( $_SERVER[“PHP_SELF”] )
$_SERVER is another useful superglobal, similar to the ones you encountered in Chapters 7 and 9. It
stores various values related to the Web server and script environment. The “ PHP_SELF ” element stores
the URL of the current page relative to the top level of the Web site. For example, if a PHP script at
http://www.example.com/myscripts/script.php is viewed, $_SERVER[ “ PHP_SELF “ is set to
]
/myscripts/script.php . For the purposes of this application, you only want to store the filename of
the page — for example, diary.php — so you use PHP ’ s basename() function to remove the path

portion of the URL.
You looked at sessions in Chapter 10, and you look at the $_SERVER superglobal in more detail in
Chapter 16.

Writing the Login Page Script

Now that you ’ ve updated your classes and common code, you ’ re ready to create the script to display
and handle the member login page. First, create a members folder within your book_club folder; this
folder will hold not only the login script, but also the protected pages of the members ’ area. Within this
members folder, create the following script and call it login.php :

< ?php
require_once( “../common.inc.php” );
session_start();

if ( isset( $_POST[“action”] ) and $_POST[“action”] == “login” ) {
processForm();
} else {
displayForm( array(), array(), new Member( array() ) );
}

function displayForm( $errorMessages, $missingFields, $member ) {
displayPageHeader( “Login to the book club members’ area”, true );

if ( $errorMessages ) {
foreach ( $errorMessages as $errorMessage ) {
echo $errorMessage;
}
} else {
? >
< p > To access the members’ area, pleas enter your username and password
below then click Login. < /p >
< ?php } ? >

< form action=”login.php” method=”post” style=”margin-bottom: 50px;” >
< div style=”width: 30em;” >
< input type=”hidden” name=”action” value=”login” / >

< label for=”username” < ?php validateField( “username”, $missingFields )
? > > Username < /label >

421

9/21/09 9:14:09 AM
c14.indd 421
c14.indd 421 9/21/09 9:14:09 AM