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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 |
|---|---|
| 3 | require_once( 'admin.php' ); |
| 4 | require_once(ABSPATH . 'wp-admin/includes/widgets.php'); |
| 5 | |
| 6 | if ( ! current_user_can('switch_themes') ) |
| 7 | wp_die( __( 'Cheatin’ uh?' )); |
| 8 | |
| 9 | wp_enqueue_script( array( 'wp-lists', 'admin-widgets' ) ); |
| 10 | wp_admin_css( 'widgets' ); |
| 11 | |
| 12 | do_action( 'sidebar_admin_setup' ); |
| 13 | |
| 14 | $title = __( 'Widgets' ); |
| 15 | $parent_file = 'themes.php'; |
| 16 | |
| 17 | // $sidebar = What sidebar are we editing? |
| 18 | if ( isset($_GET['sidebar']) && isset($wp_registered_sidebars[$_GET['sidebar']]) ) { |
| 19 | $sidebar = attribute_escape( $_GET['sidebar'] ); |
| 20 | } elseif ( is_array($wp_registered_sidebars) && !empty($wp_registered_sidebars) ) { |
| 21 | // By default we look at the first defined sidebar |