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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 |
|---|---|
| 347 | $items = apply_filters( 'wp_nav_menu_items', $items, $args ); |
| 348 | /** |
| 349 | * Filter the HTML list content for a specific navigation menu. |
| 350 | * |
| 351 | * @since 3.0.0 |
| 352 | * |
| 353 | * @param string $items The HTML list content for the menu items. |
| 354 | * @param array $args Arguments from {@see wp_nav_menu()}. |
| 355 | */ |
| 356 | $items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args ); |
| 357 | |
| 358 | // Don't print any markup if there are no items at this point. |
| 359 | if ( empty( $items ) ) |
| 360 | return false; |
| 361 | |
| 362 | $nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items ); |
| 363 | unset( $items ); |
| 364 | |
| 365 | if ( $show_container ) |