überveilig login systeem :')

<?php
session_start();

/* 

Copyright 2007 Thomaz.eu.tc

Alle rechten voorbehouden.

*/

if ($_SERVER['REQUEST_METHOD'] == "POST")
{
    
    $filename = "pass.txt";
    $handle = fopen ($filename, "rb");
    $contents = fread ($handle, filesize ($filename));
    fclose ($handle);
    
    $filenameu = "user.txt";
    $handleu = fopen ($filenameu, "rb");
    $contentsu = fread ($handleu, filesize ($filenameu));
    fclose ($handleu);
    
    function codeer($pass)
    {
        $pass = md5(md5(base64_decode($pass)));
        
        $ab = str_split($pass, 15);
        
        $a = 5454;
        
        $ab[0] = $ab[0]."".$a;
        
        $ab[1] = $ab[1]."".$a;
        
        $ab[2] = $ab[2]."".$a;
        
        $uiteindelijk = $ab[0]."903".$ab[1]."512".$ab[2];
        
        return $uiteindelijk;
    }    
    
    $wachtwoorden = explode (" ", $contents); 
    
    $wachtwoord = codeer($_POST['pass']);
    
    $users = explode (" ", $contentsu); 
    
    $user = strtolower(base64_decode($_POST['user']));
    
    /*
    
    Kijken of het juist is
    
    */
    
    if (in_array ($wachtwoord, $wachtwoorden) && in_array ($user, $users))
    {
        echo "juist";
        $_SESSION['login'] == "ja";
    }
    else
    {
        echo "onjuist";
        echo $user;
    }
}
else
{
    echo '
    
    <form name="form1" method="post" action="">
      <p>
        <input name="pass" type="password" size="50"><br />
        <input name="user" type="text" size="50">
    </p>
      <p>
        <input type="submit" name="Submit" value="inloggen">
    </p>
    </form>
    
    ';
}

?>