basic php form with HTML markup

form.html

<!-- HTML form -->
<form method="POST" action="process.php">
    <input type="text" name="name" placeholder="Your name">
    <input type="submit" value="Submit">
</form>

form.php

<!-- process.php -->
<?php
if ($_SERVER["REQUEST_METHOD"] === "POST") {
    $name = $_POST["name"];
    echo "Hello, " . $name . "!";
}
?>