How to remove external links in php

php method to remove external links: add the [rel="nofollow"] attribute to the link, the code is [$a['content'] = content_nofollow($a['content'],$domain) ;].

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php method to remove external links:

Solution: It is necessary to filter the content within the site, and add rel=" to links that are not internal links nofollow" attribute.

This article draws on wordpress’s function for filtering external links, and you can use it by changing it.

The specific code is as follows:

//外部链接增加nofllow $content 内容 $domain 当前网站域名
function content_nofollow($content,$domain){
 preg_match_all('/href="(.*?)"/',$content,$matches);
 if($matches){
 foreach($matches[1] as $val){
  if( strpos($val,$domain)===false ) $content=str_replace('href="'.$val.'"', 'href="'.$val.'" rel="external nofollow" ',$content);
 }
 }
 preg_match_all('/src="(.*?)"/',$content,$matches);
 if($matches){
 foreach($matches[1] as $val){
  if( strpos($val,$domain)===false ) $content=str_replace('src="'.$val.'"', 'src="'.$val.'" rel="external nofollow" ',$content);
 }
 }
 return $content;
}

It is easy to call when calling. The following is a calling demonstration

$a['content'] = content_nofollow($a['content'],$domain);  //将文章内容里的链接增加nofllow属性

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