Run PHP Function once

Question

Is there a way to run a PHP FUNCTION \"fun();\" only once when a logged in user accesses a page multiple times?

here is the function.

Answer 1

Can you not run the function, then store a $_SESSION variable? For example:

if (!isset($_SESSION['function_ran']) || $_SESSION['function_ran'] != '1') {
    fun(); // run function
    $_SESSION['function_ran'] = '1';
}