How does the method attribute in a <form> tag affect the usage of $_REQUEST, $_POST, and $_GET in PHP?

When submitting a form in HTML, the method attribute in the <form> tag determines how the form data is sent to the server. If the method is set to "post", the form data is sent in the request body, and PHP can access it using the $_POST superglobal. If the method is set to "get", the form data is sent as part of the URL, and PHP can access it using the $_GET superglobal. To ensure that PHP can access form data regardless of the method used, you can use the $_REQUEST superglobal, which combines data from both $_POST and $_GET. This allows you to access form data without worrying about the specific method used.

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
} else if ($_SERVER["REQUEST_METHOD"] == "GET") {
    $username = $_GET['username'];
}

// Alternatively, you can use $_REQUEST to access form data regardless of the method
$username = $_REQUEST['username'];
?>