文章内外部链接添加nofollow

/*
* WordPress给文章外链添加nofollow有助于seo优化
*/
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,$match