curl入门知识之抓取数据并分析链接或Url

<?php/* *下面的程序本人看到的外国的一个例子，我进行了翻译和加工 *Email:[e-mail]*//*这个简单的例子要检查一个网页中的<a></a>中的链接段*/// 要检查的网页中的链接$url="http://michaelphipps.com";// 被检查的网页页面$link_page="http://curl.haxx.se/libcurl/php/examples/multi.html";// 利用 Curl 返回网页会话资源$ch = curl_init();curl_setopt($ch, CURLOPT_URL,$link_page);curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);$result=curl_exec ($ch);curl_close ($ch);// Search for the $url on the $link_page./*（下面的匹配模式有待完善，译者注）*/preg_match ("|<[aA] (.+?)".$url."(.+?)>(.+?)<//[aA]>|i", $result, $matches);// See if there were any matches/*注意： preg_match 这个函数仅仅第一个匹配的, preg_match_all 这个函数可以返回所有能被匹配的链接)*/if (count($matches)>0){ // if there are items in the array, then there was a match. echo "The link exists on the target website"; print_r($matches); /* 如果需要一个比较特殊的链接文本，您需要改变查找的方式，而不是再匹配<a></a>标签了 If you require very specific link text you can use the information returned in the $matches array to further assess if your website is being linked the way you want. */}else{ // if there are no items in the array, then no matches were found. echo "The link does not exist on the target website";}?>