[WordPress]カスタム投稿タイプ記事一覧にタクソノミー絞り込み機能を追加
functions.php
/**
* WP_Termの配列の各要素にterm_ordersを設定する
*
* @param array $terms
*
*/
function set_parents_term_orders_to_terms(&$terms)
{
if(empty($terms)){
return;
}
foreach ($terms as $i => $term) {
$terms[$i]->term_orders = [$term->term_order];
if(!empty($term->parent)){
$tmp = $term;
while(!empty($tmp->parent)){
$tmp_id = $tmp->term_id;
foreach ($terms as $j => $term_) {
if($tmp->parent === $term_->term_id){
array_unshift($terms[$i]->term_orders,$term_->term_order);
$tmp = $term_;
break;
}
}
if($tmp_id === $tmp->term_id){
break;
}
}
}
}
}
/**
* WP_Termの配列をterm_ordersに則ってソートする
* set_parents_term_orders_to_terms を実行してから使用する
*
* @param array $terms
*
*/
function sort_terms_by_term_orders(&$terms)
{
usort($terms,function($a,$b){
$imax = max(count($a->term_orders),count($b->term_orders));
for($i=0;$i<$imax;$i++){
if(count($a->term_orders) <= $i){
return -1;
}
if(count($b->term_orders) <= $i){
return 1;
}
if($a->term_orders[$i] === $b->term_orders[$i]){
continue;
}
return ($a->term_orders[$i] > $b->term_orders[$i]) ? 1 : -1;
}
});
}
/**
* 管理画面記事一覧カテゴリフィルタ追加
*/
function add_post_taxonomy_restrict_filter()
{
global $post_type;
if($post_type === 'カスタム投稿タイプ'){
?>
<select name="タクソノミー">
<option value="">カテゴリーを指定する</option>
<?php
$terms = get_terms('タクソノミー');
/*
プラグイン「Category Order and Taxonomy Terms Order」導入済みの場合
set_parents_term_orders_to_terms($terms);
sort_terms_by_term_orders($terms);
*/
foreach ($terms as $term) { ?>
<option value="<?php echo $term->slug; ?>"><?php echo $term->name; ?></option>
<?php } ?>
</select>
<?php
}
}
add_action('restrict_manage_posts', 'add_post_taxonomy_restrict_filter');