PHP'leri Şifreleme

<?php

$kul[0]['username']="admin";
$kul[0]['password']="turkhackteam";


// Dogrulama

function authenticate()
{
header( 'WWW-Authenticate: Basic realm="Private"' );
header( 'HTTP/1.0 401 Unauthorized' );
echo 'Authorization Required.';
exit;
}

if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW'])) { authenticate(); } else
{
for($i=0;$i<count($kul);$i++) { if($_SERVER['PHP_AUTH_USER']==$kul[$i]['username'] && $_SERVER['PHP_AUTH_PW']==$kul[$i]['password']){$auth=TRUE;}}
if($auth !=TRUE) {authenticate();}
}