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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 |
|---|---|
| 33 | /* Instantiate the admin bar */ |
| 34 | |
| 35 | /** |
| 36 | * Filters the admin bar class to instantiate. |
| 37 | * |
| 38 | * @since 3.1.0 |
| 39 | * |
| 40 | * @param string $wp_admin_bar_class Admin bar class to use. Default 'WP_Admin_Bar'. |
| 41 | */ |
| 42 | $admin_bar_class = apply_filters( 'wp_admin_bar_class', 'WP_Admin_Bar' ); |
| 43 | if ( class_exists( $admin_bar_class ) ) { |
| 44 | $wp_admin_bar = new $admin_bar_class; |
| 45 | } else { |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | $wp_admin_bar->initialize(); |
| 50 | $wp_admin_bar->add_menus(); |
| 51 | |