Pass parameter to the callback function from a custom page

[abdfahim]

What is the best way to pass some parameter to the PHP callback function from a custom page.

Let say, in a custom page, I show all the members' username and country. I have 2 buttons to sort the list by username or by country.

So, when a user clicks either of the buttons, I want to reload the data accordingly, hence need to pass the sort parameter to the PHP callback function to sort the data while fetching from the database.

 

[grisha2217]

For example, we can read $_GET parametr 'sort':
http://site.com/members/?sort=country
http://site.com/members/?sort=username

Filter this param in action:

$sortBy = $this->_input->filterSingle('sort', XenForo_Input::STRING);

$allowedTypes = array('country', 'username');
if (in_array($sortBy, $allowedTypes))
{
    // do something
}