Logout er stoppet med at virke

PHP kode 

 <?php require_once("includes/functions.php"); ?>
 <?php
         // Four steps to closing a session
         // (i.e. logging out)
 
         // 1. Find the session
         session_start();
         
         // 2. Unset all the session variables
         $_SESSION = array();
         
         // 3. Destroy the session cookie
         if(isset($_COOKIE[session_name()])) {
             setcookie(session_name(), '', time()-42000, '/');
         }
         
         // 4. Destroy the session
         session_destroy();
         
         header("Location: adresse");
 ?>

PHP kode 

 <?php
     function mysql_prep( $value ) {
         $magic_quotes_active = get_magic_quotes_gpc();
         $new_enough_php = function_exists( "mysql_real_escape_string" ); // i.e. PHP >= v4.3.0
         if( $new_enough_php ) { // PHP v4.3.0 or higher
             // undo any magic quote effects so mysql_real_escape_string can do the work
             if( $magic_quotes_active ) { $value = stripslashes( $value ); }
             $value = mysql_real_escape_string( $value );
         } else { // before PHP v4.3.0
             // if magic quotes aren't already on then add slashes manually
             if( !$magic_quotes_active ) { $value = addslashes( $value ); }
             // if magic quotes are active, then the slashes already exist
         }
         return $value;
     }
 
 
 
     function redirect_to( $location = NULL ) {
         if ($location != NULL) {
             header("Location: {$location}");
             exit;
         }
     }
 ?>