Wordpress: Passing parameters through add_menu_page()

add_menu_page.php

<?php

// Our parameters-array, where all params stored (for all custom pages)
$params = array();
add_action('admin_menu', 'my_admin_menu');

function my_admin_menu()
{
    global $params;
    $hook = add_menu_page('My Page', 'My Page', 'administrator', 'my-page', 'get_my_template');

    // Set params for the above declared page-hook
    $params[$hook] = array('template'=>'my-page.php', 'title' => 'My Page Title');
}

function get_my_template()
{
    global $params;

    // Get parameters for current page from param-array
    $param = $params[current_filter()];

    // Extract our params to variables (variable-names equal to array-keys from above)
    // $template, $title, ...
    extract($param);

    // Sample include of template
    include $template;
}