How to replace numbers in the $GET parameter string with a regular expression?

Question

PHP

Greetings.

Tell me how in the condition line:

if (isset($_GET['PAGEN_1']) && intval($_GET['PAGEN_1'])>0) {

replace the number 1 in PAGEN_1 with any integer so that the condition is fulfilled.
I do not quite understand how to correctly write a regular expression in such a construction.

Thank you!

Answer 1

Something like this:

foreach ($_GET as $key => $value) {
  if (preg_match('/^PAGEN_(\d+)$/', $key, $matches)) {
    // пользователь передал параметр $_GET[$key] со значением $value, номер сохранён в $matches[1]
  }
}