MksYi

<?php
function encode2($str) {
    for ($i = 1;$i <= $_POST['num'];$i++) {
        $str = 'eval(gzinflate(base64_decode("'.base64_encode(gzdeflate($str)).'")));';
    }
    return $str;
}
function encode3($str) {
    $mh_1 = str_replace("gzinflate", "\$_X", $str);
    $mh_2 = str_replace("base64_decode", "\$_T", $mh_1);