/* 屏蔽纯英文评论和纯日文 */
function refused_english_comments($incoming_comment) {
    $pattern = '/[一-龥]/u';
    // 禁止全英文评论
     if(!preg_match($pattern, $incoming_comment['comment_content'])) {
     echo (json_encode(array('error' => 1, 'msg' => '您的评论中必须包含汉字！')));
            exit();
    }
    $pattern = '/[あ-んア-ン]/u';
    // 禁止日文评论
     if(preg_match($pattern, $incoming_comment['comment_content'])) {
     echo (json_encode(array('error' => 1, 'msg' => '评论禁止包含日文！')));
            exit();
     }
    return( $incoming_comment );
    }
add_filter('preprocess_comment', 'refused_english_comments');