When a user submit a FORM on your WEB server, user entered data will be TRANSFERRED to the PHP engine, which will make the submitted data available to your PHP script for PROCESSING in pre-defined ARRAYS:
• $_GET - An associate array that store form data submitted with the GET method.
• $_POST - An associate array that store form data submitted with the POST method.
• $_REQUEST - An associate array that store form data submitted with either GET or POST method. $_REQUEST also contains the cookie values received back from the browser.

When a user submit a form on your Web server, user entered data will be transferred to the PHP engine, which will make the submitted data available to your PHP script for processing in pre-defined arrays:
• $_GET - An associate array that store form data submitted with the GET method.
• $_POST - An associate array that store form data submitted with the POST method.
• $_REQUEST - An associate array that store form data submitted with either GET or POST method. $_REQUEST also contains the cookie values received back from the browser.