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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.
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581 | * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object. |
582 | * |
583 | * @see WP_Query::query() |
584 | * |
585 | * @param object[] $posts The posts for the current post type. Mostly `WP_Post` objects, but |
586 | * can also contain "fake" post objects to represent other menu items. |
587 | * @param array $args An array of `WP_Query` arguments. |
588 | * @param WP_Post_Type $post_type The current post type object for this menu item meta box. |
589 | */ |
590 | $posts = apply_filters( "nav_menu_items_{$post_type_name}", $posts, $args, $post_type ); |
591 |
|
592 | $checkbox_items = walk_nav_menu_tree( array_map( 'wp_setup_nav_menu_item', $posts ), 0, (object) $args ); |
593 |
|
594 | if ( 'all' == $current_tab && ! empty( $_REQUEST['selectall'] ) ) { |
595 | $checkbox_items = preg_replace( '/(type=(.)checkbox(\2))/', '$1 checked=$2checked$2', $checkbox_items ); |
596 |
|
597 | } |
598 |
|
599 | echo $checkbox_items; |