<form action="https://php.tomgdow.com" method="POST" id="form_one">
    <fieldset>
        <legend>Personal Information</legend>
        <div class="box">
            <div>
                <label for="name">name</label>
                <input type="text" name="param1" id="name"><br>
            </div>
            <div>
                <label for="email">e-mail</label>
                <input type="email" name="param2" id="email" required><br>
            </div>
            <div class="submit">
                <input type="submit">
            </div>
        </div>
    </fieldset>
</form>

// index.php (server)

<?php
  echo  
     htmlspecialchars($_POST["param1"])."&"
     .htmlspecialchars($_POST["param2"])."&"
     .htmlspecialchars($_SERVER['HTTP_HOST']);
?>