WordPress 代码屏蔽垃圾评论方法（禁止全英文/中文字符占比/评论过滤）

//防灌水
function scp_comment_post( $incoming_comment ) {

// 禁止全英文评论
$pattern = '/[\x7f-\xff]/';
if(!preg_match($pattern, $incoming_comment['comment_content'])) {
wp_die( "您的评论中必须包含汉字! <br /> You should type some Chinese word (like \"你好\") in your comment to pass the spam-check, thanks for your patience! " );
}
//禁止 A 链接
if(strstr($incoming_comment['comment_content'], "<a")){
wp_die( "您的评论中不能有A链接,请直接填写URL地址" );

}
// 判断 中文字符占比
$len_all = strlen($incoming_comment['comment_content']); 
$len_st = mb_strlen($incoming_comment['comment_content'], 'UTF-8');
if(($len_all-$len_st)/(2*$len_st) < 0.5){
wp_die( "中文字符少于百分之五十" );
}

// 禁止日文评论
if(preg_match($pattern, $incoming_comment['comment_content'])) {
wp_die( "禁止日文评论!日本のコメントを禁止！" );
}

return( $incoming_comment );
}
add_filter('preprocess_comment', 'scp_comment_post');

//屏蔽关键词，email，url，ip
function Shield_fuckspam($comment) {
    if (wp_blacklist_check($comment['comment_author'], $comment['comment_author_email'], $comment['comment_author_url'], $comment['comment_content'], $comment['comment_author_IP'], $comment['comment_agent'])) {
        header("Content-type: text/html; charset=utf-8");
        err(__('不好意思，您的评论违反评论规则'));
    } else {
        return $comment;
    }
}
add_filter('preprocess_comment', 'Shield_fuckspam');

function antiEmptyUA(){
    //获取UA信息
$ua = $_SERVER['HTTP_USER_AGENT'];
//将恶意USER_AGENT存入数组
$now_ua = array('FeedDemon ','BOT/0.1 (BOT for JCE)','CrawlDaddy ','Java','Feedly','UniversalFeedParser','ApacheBench','Swiftbot','ZmEu','Indy Library','oBot','jaunty','YandexBot','AhrefsBot','YisouSpider','jikeSpider','MJ12bot','WinHttp','EasouSpider','HttpClient','Microsoft URL Control','YYSpider','jaunty','Python-urllib','lightDeckReports Bot');//禁止空USER_AGENT，dedecms等主流采集程序都是空USER_AGENT，部分sql注入工具也是空USER_AGENT
if(!$ua) {
header("Content-type: text/html; charset=utf-8");
wp_die('机器人，滚粗！');
}else{
foreach($now_ua as $value )
//判断是否是数组中存在的UA
if(eregi($value,$ua)) {
header("Content-type: text/html; charset=utf-8");
wp_die('机器人，滚粗！');
}
}
}

function antiEmptyUA(){
 //获取UA信息
$ua = $_SERVER['HTTP_USER_AGENT'];
//将恶意USER_AGENT存入数组
$now_ua = array('FeedDemon ','BOT/0.1 (BOT for JCE)','CrawlDaddy ','Java','Feedly','UniversalFeedParser','ApacheBench','Swiftbot','ZmEu','Indy Library','oBot','jaunty','YandexBot','AhrefsBot','YisouSpider','jikeSpider','MJ12bot','WinHttp','EasouSpider','HttpClient','Microsoft URL Control','YYSpider','jaunty','Python-urllib','lightDeckReports Bot');//禁止空USER_AGENT，dedecms等主流采集程序都是空USER_AGENT，部分sql注入工具也是空USER_AGENT
if(!$ua) {
header("Content-type: text/html; charset=utf-8");
wp_die('请勿采集本站！');
}else{
 foreach($now_ua as $value )
//判断是否是数组中存在的UA
 if(eregi($value,$ua)) {
 header("Content-type: text/html; charset=utf-8");
 wp_die('请勿采集本站！');
 }
}
}

# BEGIN 屏蔽垃圾留言：屏蔽空referrer留言
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_METHOD} POST
RewriteCond %{REQUEST_URI} .wp-comments-post\.php*
RewriteCond %{HTTP_REFERER} !.*wangbaiyuan.cn.* [OR]
RewriteCond %{HTTP_USER_AGENT} ^$
RewriteRule (.*) ^http://%{REMOTE_ADDR}/$ [R=301,L]
</IfModule>
# END 屏蔽垃圾留言：屏蔽空referrer留言