Conversion de la sortie des éléments nav_menu dans un tableau multidimensionnel en forme d'arborescence
Est-il possible de saisir les éléments du menu de navigation sous forme de tableau multidimensionnel au lieu d'un tableau plat?
Par structure arborescente, je veux dire quelque chose qui préserverait la relation entre les éléments enfant et parent, comme ceci (ce n'est qu'un exemple)…
array(
array(
'post_type' => 'page',
'post_name' => 'Home',
'children' => array()
),
array(
'post_type' => 'page',
'post_name' => 'About Us',
'children' => array(
array(
'post_type' => 'page',
'post_name' => 'Our History',
'children' => array()
)
)
)
)
Il y a une fonction wp_get_nav_menu_items() mais elle retourne un tableau à 1 dimension avec tous les éléments du même niveau, ce qui n'est pas ce que je veux. WordPress inclut-il un moyen intégré d’obtenir un tableau multidimensionnel pour mes éléments de menu? Sinon, quel est le meilleur moyen d’obtenir wp_get_nav_menu_items() sous la forme d’une structure arborescente dans un tableau multidimensionnel en termes de performances?
Le problème de construire un arbre à partir d'un tableau plat a été résolu ici avec cette solution récursive légèrement modifiée:
/**
* Modification of "Build a tree from a flat array in PHP"
*
* Authors: @DSkinner, @ImmortalFirefly and @SteveEdson
*
* @link https://stackoverflow.com/a/28429487/2078474
*/
function buildTree( array &$elements, $parentId = 0 )
{
$branch = array();
foreach ( $elements as &$element )
{
if ( $element->menu_item_parent == $parentId )
{
$children = buildTree( $elements, $element->ID );
if ( $children )
$element->wpse_children = $children;
$branch[$element->ID] = $element;
unset( $element );
}
}
return $branch;
}
où nous avons ajouté l'attribut préfixé wpse_children pour éviter la collision de noms.
Il ne reste plus qu’à définir une fonction d’aide simple:
/**
* Transform a navigational menu to it's tree structure
*
* @uses buildTree()
* @uses wp_get_nav_menu_items()
*
* @param String $menud_id
* @return Array|null $tree
*/
function wpse_nav_menu_2_tree( $menu_id )
{
$items = wp_get_nav_menu_items( $menu_id );
return $items ? buildTree( $items, 0 ) : null;
}
Maintenant, il devient très facile de transformer un menu de navigation en une arborescence avec:
$tree = wpse_nav_menu_2_tree( 'my_menu' ); // <-- Modify this to your needs!
print_r( $tree );
Pour JSON, nous pouvons simplement utiliser:
$json = json_encode( $tree );
Pour une version légèrement différente, où nous avons sélectionné les attributs, consultez la première révision de cette réponse ici .
Mise à jour: Walker Class
Voici une idée assez floue sur la manière dont nous pourrions essayer de nous accrocher à la partie récursive de la méthode display_element() de la classe abstract Walker.
$w = new WPSE_Nav_Menu_Tree;
$args = (object) [ 'items_wrap' => '', 'depth' => 0, 'walker' => $w ];
$items = wp_get_nav_menu_items( 'my_menu' );
walk_nav_menu_tree( $items, $args->depth, $args );
print_r( $w->branch );
où WPSE_Nav_Menu_Tree est une extension de la classe Walker_Nav_Menu:
class WPSE_Nav_Menu_Tree extends Walker_Nav_Menu
{
public $branch = [];
public function display_element($element, &$children, $max_depth, $depth = 0, $args, &$output )
{
if( 0 == $depth )
$this->branch[$element->ID] = $element;
if ( isset($children[$element->ID] ) )
$element->wpse_children = $children[$element->ID];
parent::display_element($element, $children, $max_depth, $depth, $args, $output);
}
}
Cela pourrait nous donner une approche alternative si cela fonctionne.
En bref, la fonction ci-dessous crée l'arborescence des objets en plaçant les enfants dans une nouvelle propriété enfants à l'intérieur de l'objet parent.
Code:
function wpse170033_nav_menu_object_tree( $nav_menu_items_array ) {
foreach ( $nav_menu_items_array as $key => $value ) {
$value->children = array();
$nav_menu_items_array[ $key ] = $value;
}
$nav_menu_levels = array();
$index = 0;
if ( ! empty( $nav_menu_items_array ) ) do {
if ( $index == 0 ) {
foreach ( $nav_menu_items_array as $key => $obj ) {
if ( $obj->menu_item_parent == 0 ) {
$nav_menu_levels[ $index ][] = $obj;
unset( $nav_menu_items_array[ $key ] );
}
}
} else {
foreach ( $nav_menu_items_array as $key => $obj ) {
if ( in_array( $obj->menu_item_parent, $last_level_ids ) ) {
$nav_menu_levels[ $index ][] = $obj;
unset( $nav_menu_items_array[ $key ] );
}
}
}
$last_level_ids = wp_list_pluck( $nav_menu_levels[ $index ], 'db_id' );
$index++;
} while ( ! empty( $nav_menu_items_array ) );
$nav_menu_levels_reverse = array_reverse( $nav_menu_levels );
$nav_menu_tree_build = array();
$index = 0;
if ( ! empty( $nav_menu_levels_reverse ) ) do {
if ( count( $nav_menu_levels_reverse ) == 1 ) {
$nav_menu_tree_build = $nav_menu_levels_reverse;
}
$current_level = array_shift( $nav_menu_levels_reverse );
if ( isset( $nav_menu_levels_reverse[ $index ] ) ) {
$next_level = $nav_menu_levels_reverse[ $index ];
foreach ( $next_level as $nkey => $nval ) {
foreach ( $current_level as $ckey => $cval ) {
if ( $nval->db_id == $cval->menu_item_parent ) {
$nval->children[] = $cval;
}
}
}
}
} while ( ! empty( $nav_menu_levels_reverse ) );
$nav_menu_object_tree = $nav_menu_tree_build[ 0 ];
return $nav_menu_object_tree;
}
Usage:
$nav_menu_items = wp_get_nav_menu_items( 'main-menu' );
wpse170033_nav_menu_object_tree( $nav_menu_items );
Sortie:
Array
(
[0] => WP_Post Object
(
[ID] => 51
[post_author] => 1
[post_date] => 2015-06-26 21:13:23
[post_date_gmt] => 2015-06-26 19:13:23
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 51
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://example.com/?p=51
[menu_order] => 1
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 51
[menu_item_parent] => 0
[object_id] => 2
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page/
[title] => Example-Page-1
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
[0] => WP_Post Object
(
[ID] => 80
[post_author] => 1
[post_date] => 2015-06-27 14:03:31
[post_date_gmt] => 2015-06-27 12:03:31
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 80
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 2
[guid] => http://example.com/?p=80
[menu_order] => 2
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 80
[menu_item_parent] => 51
[object_id] => 69
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page/subpage-1/
[title] => Subpage-1
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
)
)
)
)
[1] => WP_Post Object
(
[ID] => 49
[post_author] => 1
[post_date] => 2015-06-26 21:13:23
[post_date_gmt] => 2015-06-26 19:13:23
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 49
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://example.com/?p=49
[menu_order] => 3
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 49
[menu_item_parent] => 0
[object_id] => 41
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-2/
[title] => Example-Page-2
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
)
)
[2] => WP_Post Object
(
[ID] => 48
[post_author] => 1
[post_date] => 2015-06-26 21:13:23
[post_date_gmt] => 2015-06-26 19:13:23
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 48
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 0
[guid] => http://example.com/?p=48
[menu_order] => 4
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 48
[menu_item_parent] => 0
[object_id] => 42
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-3/
[title] => Example-Page-3
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
[0] => WP_Post Object
(
[ID] => 79
[post_author] => 1
[post_date] => 2015-06-27 14:03:31
[post_date_gmt] => 2015-06-27 12:03:31
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 79
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 42
[guid] => http://example.com/?p=79
[menu_order] => 5
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 79
[menu_item_parent] => 48
[object_id] => 70
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-3/subpage-2/
[title] => Subpage-2
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
[0] => WP_Post Object
(
[ID] => 78
[post_author] => 1
[post_date] => 2015-06-27 14:03:31
[post_date_gmt] => 2015-06-27 12:03:31
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 78
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 70
[guid] => http://example.com/?p=78
[menu_order] => 6
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 78
[menu_item_parent] => 79
[object_id] => 76
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-3/subpage-2/subpage-3/
[title] => Subpage-3
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
[0] => WP_Post Object
(
[ID] => 87
[post_author] => 1
[post_date] => 2015-06-27 15:27:08
[post_date_gmt] => 2015-06-27 13:27:08
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 87
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 76
[guid] => http://example.com/?p=87
[menu_order] => 7
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 87
[menu_item_parent] => 78
[object_id] => 85
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-3/subpage-2/subpage-3/subpage-4/
[title] => Subpage-4
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
[0] => WP_Post Object
(
[ID] => 366
[post_author] => 1
[post_date] => 2015-07-29 20:52:46
[post_date_gmt] => 2015-07-29 18:52:46
[post_content] =>
[post_title] =>
[post_excerpt] =>
[post_status] => publish
[comment_status] => open
[ping_status] => open
[post_password] =>
[post_name] => 366
[to_ping] =>
[pinged] =>
[post_modified] => 2015-07-29 20:55:10
[post_modified_gmt] => 2015-07-29 18:55:10
[post_content_filtered] =>
[post_parent] => 85
[guid] => http://example.com/?p=366
[menu_order] => 8
[post_type] => nav_menu_item
[post_mime_type] =>
[comment_count] => 0
[filter] => raw
[db_id] => 366
[menu_item_parent] => 87
[object_id] => 112
[object] => page
[type] => post_type
[type_label] => Page
[url] => http://example.com/example-page-3/subpage-2/subpage-3/subpage-4/subpage-5/
[title] => Subpage-5
[target] =>
[attr_title] =>
[description] =>
[classes] => Array
(
[0] =>
)
[xfn] =>
[children] => Array
(
)
)
)
)
)
)
)
)
)
)
)
Version modifiée de la réponse acceptée qui prend en compte la propriété menu_order des éléments de menu afin de conserver le bon ordre du tableau à plat d'origine. menu_order est défini automatiquement par WordPress donc pas besoin de vérifier quoi que ce soit:
function buildTree(array &$flatNav, $parentId = 0) {
$branch = [];
foreach ($flatNav as &$navItem) {
if($navItem->menu_item_parent == $parentId) {
$children = buildTree($flatNav, $navItem->ID);
if($children) {
$navItem->children = $children;
}
$branch[$navItem->menu_order] = $navItem;
unset($navItem);
}
}
return $branch;
}
Utilisation:
// get navs
$locations = get_nav_menu_locations();
// get menu items by menu name
$flatMainNav = wp_get_nav_menu_items($locations['main']);
$mainNav = buildTree($flatMainNav);