Return value of add_menu_page

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I’ve read this on codex and seem some themes use it but never understood how it worked.

(string) $hookname used internally to track menu page callbacks for outputting the page inside the global $menu array

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I can’t seem to understand the codex’s explanation. Can some one enlighten me on how can we use the return value and what are the uses of it?

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2 comments

  1. One important use is enqueue script / style only on specific plugin/admin pages.

    <?php
    add_action('init', 'my_plugin_admin_page');

    function my_plugin_admin_page()
    {
        //create the menu page
        $hook = add_menu_page(....);

        //use the hook for this page for enqueuing
        add_action('admin_print_styles-' . $hook, 'my_plugin_admin_styles');
    }

    function my_plugin_admin_styles()
    {
        //enqueue the style/script here
    }
?>

    This is one use I know.

  2. Hope code is self-explanatory.

    // Add a new submenu page and also add a load handler for it to process POSTs
($hook_name = add_submenu_page(
    'plugins.php', // Under plugins menu
    'Title',
    'Menu',
    'activate_plugins', // Administrators
    'slug',
    function(){ // Visual is here ?>
        <div class="wrap">
            <h2>Sub-Page Title</h2>
            <!-- Subpage visual output comes here -->
        </div>
<?php })) and (add_action("load-{$hook_name}", function(){ // Hook the load here
    if(!strcasecmp($_SERVER['REQUEST_METHOD'], 'POST')){
        $_POST =  stripslashes_deep($_POST); // Fix this WP BS security joke
        // Handle a POST request
        // ... Do stuff with $_POST
    }elseif(!strcasecmp($_SERVER['REQUEST_METHOD'], 'GET')){
        // Handle a GET (normal) request
        // ... Usually not needed
    }
}));

    Have fun!