How can I see all the actions attached to an “add_action” hook?

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I’m working with the admin bar and trying to debug some of the menus and their priorities.

I know several callbacks get bound to actions, such as this one:

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add_action( 'admin_bar_menu', 'wp_admin_bar_wp_menu', 10 );

How can I see what is lined up to be called when a hook like admin_bar_menu is called?

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2 comments

  1. You can see the detailed list of the hook using this snippet:

    $hook_name = 'admin_bar_menu';
global $wp_filter;
var_dump( $wp_filter[$hook_name] );

  2. A list of callback functions:

    // list call back functions
    $hook_name = 'admin_bar_menu';
    global $wp_filter;
    echo '<h2>  Hook name: '.  $hook_name . '</h2> ';
    if( isset( $wp_filter[$hook_name]->callbacks )){
        if (is_array($wp_filter[$hook_name]->callbacks )){
        echo '<h2>callback functions > accepted_args </h2>';
            foreach(  $wp_filter[$hook_name]->callbacks as $item){
                if ( is_array( $item)){
                    foreach ( $item as $subitem){
                        echo '<P>'.  $subitem['function'].' '.$subitem['accepted_args'] . '</P>';
                    }
                    
                }
            }
    }}