WordPress如何在文章的外链中添加nofollow

//给文章外链添加 nofollow
add_filter('the_content','web589_the_content_nofollow',999);
function web589_the_content_nofollow($content){
preg_match_all('/href="(.*?)" rel="external nofollow"  rel="external nofollow" /',$content,$matches);
if($matches){
foreach($matches[1] as $val){
if( strpos($val,home_url())===false ) $content=str_replace("href="$val" rel="external nofollow"  rel="external nofollow" ", "href="$val" rel="external nofollow"  rel="external nofollow"  rel="nofollow" ",$content);
}
}
return $content;
}

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