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When HTML form send data to the server, PHP can extract the data for processing.

PHP - POST

In post method HTML code looked this:

POST Code Excert:

This means that the form data will be submitted to the "process.php" web page using the POST method.

In POST method, the data is sent in the body of the request.

PHP stores all the "posted" values in an associative array called "$_POST".

The values of "name" of the form became the keys in the "$_POST" associative array.

PHP - POST:

$quantity = $_POST['quantity'];
$item = $_POST['item'];

As the names in a form are used as the keys in the associative array, make sure that names of input items are unique.

If not there will be problems.

PHP - GET

The alternative to the post method is get.

HTML form using the get method looks like this:

GET Code Excert:

This means that the form data will be submitted to the "process.php" web page using the GET method.

In get method, the data is sent by appending them to the end of the URL

The URL, after clicking submit, would have this added on to the end of it:

item=book&quantity=2

The question mark "?" tells the browser that the following items are variables.

The values of "name" of the form became the keys in the "$_GET" associative array.

PHP - GET:

$quantity = $_GET['quantity'];
$item = $_GET['item'];

Note
For more detail please see Php Manual at http://www.php.net