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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 |
|---|---|
| 1257 | |
| 1258 | /** |
| 1259 | * Filters the Walker class used when adding nav menu items. |
| 1260 | * |
| 1261 | * @since 3.0.0 |
| 1262 | * |
| 1263 | * @param string $class The walker class to use. Default 'Walker_Nav_Menu_Edit'. |
| 1264 | * @param int $menu_id ID of the menu being rendered. |
| 1265 | */ |
| 1266 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
| 1267 | |
| 1268 | if ( class_exists( $walker_class_name ) ) { |
| 1269 | $walker = new $walker_class_name(); |
| 1270 | } else { |
| 1271 | return new WP_Error( |
| 1272 | 'menu_walker_not_exist', |
| 1273 | sprintf( |
| 1274 | /* translators: %s: Walker class name. */ |
| 1275 | __( 'The Walker class named %s does not exist.' ), |