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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 |
|---|---|
| 27 | /* Instantiate the admin bar */ |
| 28 | |
| 29 | /** |
| 30 | * Filter the admin bar class to instantiate. |
| 31 | * |
| 32 | * @since 3.1.0 |
| 33 | * |
| 34 | * @param string $wp_admin_bar_class Admin bar class to use. Default 'WP_Admin_Bar'. |
| 35 | */ |
| 36 | $admin_bar_class = apply_filters( 'wp_admin_bar_class', 'WP_Admin_Bar' ); |
| 37 | if ( class_exists( $admin_bar_class ) ) |
| 38 | $wp_admin_bar = new $admin_bar_class; |
| 39 | else |
| 40 | return false; |
| 41 | |
| 42 | $wp_admin_bar->initialize(); |
| 43 | $wp_admin_bar->add_menus(); |
| 44 | |
| 45 | return true; |