In PHP web development, how do I process events?

In PHP web development, processing events can be achieved through various methods like event handlers, AJAX calls, and form submissions. Below is an example of how to handle a simple form submission event in PHP.


    <?php
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        // Collect value of input field
        $name = htmlspecialchars($_POST['name']);
        if (empty($name)) {
            echo "Name is empty";
        } else {
            echo "Hello, " . $name;
        }
    }
    ?>

    <form method="post" action="">
        Name: <input type="text" name="name">
        <input type="submit">
    </form>