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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 38 | |
| 39 | if ( empty($header_callback) ) |
| 40 | $header_callback = '_admin_bar_bump_cb'; |
| 41 | |
| 42 | add_action('wp_head', $header_callback); |
| 43 | |
| 44 | wp_enqueue_script( 'admin-bar' ); |
| 45 | wp_enqueue_style( 'admin-bar' ); |
| 46 | |
| 47 | do_action( 'admin_bar_init' ); |
| 48 | } |
| 49 | |
| 50 | function add_menu( $args = array() ) { |
| 51 | $defaults = array( |
| 52 | 'title' => false, |
| 53 | 'href' => false, |
| 54 | 'parent' => false, // false for a root menu, pass the ID value for a submenu of that menu. |
| 55 | 'id' => false, // defaults to a sanitized title value. |
| 56 | 'meta' => false // array of any of the following options: array( 'html' => '', 'class' => '', 'onclick' => '', target => '', title => '' ); |