这篇文章主要介绍了php解析字符串里所有URL地址的方法,涉及php操作数组、字符串及URL的技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了php解析字符串里所有URL地址的方法。分享给大家供大家参考。具体如下:
- <?php
- // $html = the html on the page
- // $current_url = the full url that the html came from
- //(only needed for $repath)
- // $repath = converts ../ and / and // urls to full valid urls
- function pageLinks($html, $current_url = "", $repath = false){
- preg_match_all("//<a.+?href=(/"|')(?!javascript:|#)(.+?)(/"|')/i", $html, $matches);
- $links = array();
- if(isset($matches[2])){
- $links = $matches[2];
- }
- if($repath && count($links) > 0 && strlen($current_url) > 0){
- $pathi = pathinfo($current_url);
- $dir = $pathi["dirname"];
- $base = parse_url($current_url);
- $split_path = explode("/", $dir);
- $url = "";
- foreach($links as $k => $link){
- if(preg_match("/^/././", $link)){
- $total = substr_count($link, "../");
- for($i = 0; $i < $total; $i++){
- array_pop($split_path);
- }
- $url = implode("/", $split_path) . "/" . str_replace("../", "", $link);
- }elseif(preg_match("/^/////", $link)){
- $url = $base["scheme"] . ":" . $link;
- }elseif(preg_match("/^//|^.///", $link)){
- $url = $base["scheme"] . "://" . $base["host"] . $link;
- }elseif(preg_match("/^[a-zA-Z0-9]/", $link)){
- if(preg_match("/^http/", $link)){
- $url = $link;
- }else{
- $url = $dir . "/" . $link;
- }
- }
- $links[$k] = $url;
- }
- }
- return $links;
- }
- header("content-type: text/plain");
- $url = "http://www.vevb.com";
- $html = file_get_contents($url);
- // Gets links from the page:
- print_r(pageLinks($html));
- // Gets links from the page and formats them to a full valid url:
- print_r(pageLinks($html, $url, true));
希望本文所述对大家的php程序设计有所帮助。
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