【wordpress】サイト内検索でカスタム投稿を含める

ロジック忘れないように忘備録

functions.phpなどに

/**
 * 検索ロジックカスタマイズ
 *
 */
function customSearcher($search, $wp_query) {
    if ( $wp_query->is_main_query() && $wp_query->is_search() && !is_admin() ) {
        $q = $wp_query->query_vars;
        $n = null;
        if (!empty($q['s'])) {

            $keyword = mb_convert_kana($q['s'], 's');
            $keywords = preg_split('/[\s]+/', $keyword, -1, PREG_SPLIT_NO_EMPTY);

            foreach ($keywords as $word) {
                $n = " OR ( pm.meta_key IN ( 'search_data' ) AND pm.meta_value LIKE '%" . $word . "%') ";

                $search = str_replace( "post_content LIKE '%". $word .  "%')", "post_content LIKE '%". $word .  "%')" . $n , $search );
            }

        }

    }
    return $search;
}
add_filter('posts_search', 'customSearcher', 10, 2);