<?php//要替换的文本，比如产品描述中的文字header("content-Type: text/html; charset=utf-8"); $content = ‘<li><a href="http://afish.cnblogs.com" target="_blank">小鱼阁</a></li><li><a href="http://afish.cnblogs.com" target="_blank">小鱼阁</a></li><li><a href="http://afish.cnblogs.com" target="_blank">小鱼阁</a></li><li><a href="http://www.baidu.com" target="_blank">百度</a></li><li><a href="http://www.baidu.com" target="_blank">百度</a></li><li><a href="http://www.baidu.com" target="_blank">百度</a></li><li><a href="http://www.soso.com" target="_blank">搜搜</a></li><li><a href="http://www.soso.com" target="_blank">搜搜</a></li><li><a href="http://www.soso.com" target="_blank">搜搜</a></li>‘;//本站域名$host_url = str_replace(".", "\.", str_replace("www.", "", $_SERVER[‘HTTP_HOST‘]));//echo $host_url;//替换正则$pattern = ‘/<[^>]*href=http://www.mamicode.com/[/‘/"]http?:\/\/(?!‘.str_replace("http://","",$host_url).‘|‘.str_replace("http://www.","",$host_url).‘|[\w\_]+\.‘.str_replace("http://www.","",$host_url).‘)[^\‘^\"]*[\‘\"][^>]*>(.+?)<\/a>/is‘;//替换成的内容//$replace = ‘<a href="http://‘.$_SERVER[‘HTTP_HOST‘].‘" target="_blank">$1</a>‘;$replace = ‘<a href="http://‘.$_SERVER[‘HTTP_HOST‘].‘" target="_blank">本站链接</a>‘;//进行替换$content = preg_replace($pattern, $replace, $content);//输出替换后的内容echo $content;?>