WordPress / Passing parameters to function call.

functions.php

<?php
// Steps to passing function to array
// 1. Make parameters to add to function
// 2. Set up function and pass parameter
// 3. Register function via add_action
// 4. Call do_action passing in the parameters needed
$array = array('1', '2', 3, 4);

function a_hooked_function($array) {
    var_dump($array);
}
add_action('action_name', 'a_hooked_function');

do_action('action_name', $array);
?>