What is the significance of using $_POST['submit'] instead of $_REQUEST in PHP scripts?

Using $_POST['submit'] instead of $_REQUEST in PHP scripts is significant because it ensures that the form data is submitted securely via the POST method, which is more secure than using the REQUEST method. By specifically targeting the 'submit' key in the $_POST array, you can ensure that only the form submission button triggers the processing of the form data.

if(isset($_POST['submit'])){
    // Process the form data
}