This is a simple mechanism for cycling through all the inputs to a PHP script. If you're using $_GET (variables in the query string), $_POST (variables posted with a POST method on a form) or even $_SESSION (variables stored in the session) you can use this technique.

This snippet prints out all the variables in the $_GET variable (the query string) .

foreach ($_GET as $key => $value)
{
print "$key has a value of $value";
}