一般垃圾留言的URL地址都比较长，下面这段代码可以通过判断留言者网址URL长度，自动标记为垃圾评论。今天就为大家分享WordPress自动将长URL留言标记作为垃圾评论教程。
打开你的functions.php文件粘贴下面的代码。之后自动标记URL长度超过50个字符为垃圾评论。
<?php
function rkv_url_spamcheck( $approved , $commentdata ) {
return ( strlen( $commentdata[\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’comment_author_url\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’] ) > 50 ) ? \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’spam\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ : $approved;
}
add_filter( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’pre_comment_approved\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’rkv_url_spamcheck\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, 99, 2 );
?>
可以根据需要修改其中的数字50