How can you determine if a PHP script has received data through a form submission (POST method)?

To determine if a PHP script has received data through a form submission using the POST method, you can check if the $_POST superglobal array is not empty. If it contains data, then the script has received form submission data.

if (!empty($_POST)) {
    // Form submission data has been received
    // Process the data here
} else {
    // No form submission data received
}