WordPress 对自定义的sql查询结果进行缓存

function d4p_get_query_results() {
    global $wpdb;

    $data = get_transient('my_transient_key');

    if ($data === false) {
        $data = $wpdb->get_results(' // SQL 语句 // ');
        set_transient('my_transient_key', $data, 3600 * 24);
    }

    return $data;
}

delete_transient('my_transient_key');

global $wpdb;
$transient_name = 'lc-latest-10-posts';
$post_ids = get_transient( $transient_name );
if ( $post_ids == FALSE ){
    $sql = "SELECT post.ID
    FROM $wpdb->posts post
    WHERE
        post.post_type = 'post'
    AND post.post_status = 'publish'
    ORDER BY post.post_date
    DESC
    LIMIT 0,10";
    $results = $wpdb->get_col( $sql );
    if( $results ){
        foreach ( $results as $result ){
            $post_ids[] = $result;
        }
        set_transient( $transient_name, $post_ids, 60 * 60 * 6 );
    }
}