ABCSpam.php

<?php
/*
Plugin Name: ABCSpam
Plugin URI: http://www.bbpress.me/forums/topic/me-plug-in/
Version: 0.1
Author: bbpress.me
Author URI: http://www.bbpress.me
Description: Wordpress的垃圾评论中有95%是全英文评论和含有日文字符的评论，该插件用于禁止全英文回复，有效阻止bbpress里的回复垃圾，效率高不写数据库，但有一定局限性。
*/
function bbSpamStopCheck( $comment ) { 

	$pattern = '/[一-龥]/u'; 
	 //禁止全英文评论 
	$status = preg_match($pattern, $comment);
	if(!$status) { 
		$mess = 'You should type some Chinese word (like 支持 ) in your comment to pass the spam-check, thanks for your patience! 您的评论中必须包含汉字!'; 
       	wp_die($mess . '<br /><br /><a href="' . $_SERVER['HTTP_REFERER'] .'#respond">返回</a>');
	} 
	return $comment; 

} 

add_filter('bbp_new_reply_pre_content', 'bbSpamStopCheck');
add_filter('bbp_new_topic_pre_content', 'bbSpamStopCheck');

?>