検索対象は、基本的に「記事タイトル・記事本文・抜粋文」になっています。
できればそこにカスタムフィールドの内容まで含めたい。そのような時に、function.phpに記述する内容です。
検索対象にタグとカスタムフィールドを含めるときは
function.php
function custom_search($search, $wp_query) {
global $wpdb;
if (!$wp_query->is_search)
return $search;
if (!isset($wp_query->query_vars))
return $search;
$search_words = explode(' ', isset($wp_query->query_vars['s']) ? $wp_query->query_vars['s'] : '');
if ( count($search_words) > 0 ) {
$search = '';
foreach ( $search_words as $word ) {
if ( !empty($word) ) {
$search_word = $wpdb->escape("%{$word}%");
$search .= " AND (
{$wpdb->posts}.post_title LIKE '{$search_word}'
OR {$wpdb->posts}.post_content LIKE '{$search_word}'
OR {$wpdb->posts}.ID IN (
SELECT distinct r.object_id
FROM {$wpdb->term_relationships} AS r
INNER JOIN {$wpdb->term_taxonomy} AS tt ON r.term_taxonomy_id = tt.term_taxonomy_id
INNER JOIN {$wpdb->terms} AS t ON tt.term_id = t.term_id
WHERE t.name LIKE '{$search_word}'
OR t.slug LIKE '{$search_word}'
OR tt.description LIKE '{$search_word}'
)
OR {$wpdb->posts}.ID IN (
SELECT distinct p.post_id
FROM {$wpdb->postmeta} AS p
WHERE p.meta_value LIKE '{$search_word}'
)
) ";
}
}
}
return $search;
}
add_filter('posts_search','custom_search', 10, 2);