How to retrieve input numbers in PHP?

In PHP, you can use $_GET or $_POST to retrieve input numbers. The specific methods are as follows:

1. Retrieves data sent to the server via GET method
2. http://example.com with the number 10

$number = $_GET['number'];

1. data received from an HTML form submitted via the POST method
2. amount

$number = $_POST['number'];

It should be noted that the values returned by $_GET and $_POST are in string type. If you need to convert it to a numerical type, you can use the intval() function or (int) type casting. For example:

$number = intval($_GET['number']);

Additionally, you can use the filter_input() function to retrieve input numbers and specify the type of filter. For example, to retrieve numeric parameters submitted via the GET method.

$number = filter_input(INPUT_GET, 'number', FILTER_VALIDATE_INT);

This will return the validated integer or false if validation fails.