secreto.php

<?php
    // validasi form
    $msg = "";
    $eurl = "";

    // Cek form sudah di klik submit/belum
    if(isset($_POST['submit'])){
        $url = htmlspecialchars($_POST['url']);
        $message = htmlspecialchars($_POST['message']);
        $count = htmlspecialchars($_POST['count']);

        //cek site secreto atau bukan
        $cek = strpos($url, "https://secreto.site/");
        if ($cek !== false) {
            echo "ada";
        } else {
            $eurl = '<p class="font-italic text-danger">* url ERROR</p>';
}
    }
?>