本文实例讲述了PHPCrawl爬虫库实现抓取酷狗歌单的方法。分享给大家供大家参考，具体如下：
本人看了网络爬虫相关的视频后，手痒痒，想爬点什么。最近Facebook上表情包大战很激烈，就想着把所有表情包都爬下来，却一时没有找到合适的VPN，因此把酷狗最近一月精选歌曲和简单介绍抓取到本地。代码写得有点乱，自己不是很满意，并不想放上来丢人现眼。不过转念一想，这好歹是自己第一次爬虫，于是...就有了如下不堪入目的代码~~~（由于抓取的数据量较小，所以没有考虑多进程什么的，不过我看了一下PHPCrawl的文档，发现PHPCrawl库已经把我能想到的功能都封装好了，实现起来很方便）
<?php
header("Content-type:text/html;charset=utf-8");
// It may take a whils to crawl a site ...
set_time_limit(10000);
include("libs/PHPCrawler.class.php");
class MyCrawler extends PHPCrawler {
function handleDocumentInfo($DocInfo) {
// Just detect linebreak for output ("\n" in CLI-mode, otherwise "<br>").
if (PHP_SAPI == "cli") $lb = "\n";
else $lb = "<br />";
$url = $DocInfo->url;
$pat = "/http:\/\/www\.kugou\.com\/yy\/special\/single\/\d+\.html/";
if(preg_match($pat,$url) > 0){
$this->parseSonglist($DocInfo);
}
flush();
}
public function parseSonglist($DocInfo){
$content = $DocInfo->content;
$songlistArr = array();
$songlistArr['raw_url'] = $DocInfo->url;
//解析歌曲介绍
$matches = array();
$pat = "/<span>名称：<\/span>([^(<br)]+)<br/";
$ret = preg_match($pat,$content,$matches);
if($ret>0){
$songlistArr['title'] = $matches[1];
}else{
$songlistArr['title'] = '';
}
//解析歌曲
$pat = "/<a title=\"([^\"]+)\" hidefocus=\"/";
$matches = array();
preg_match_all($pat,$content,$matches);
$songlistArr['songs'] = array();
for($i = 0;$i < count($matches[0]);$i++){
$song_title = $matches[1][$i];
array_push($songlistArr['songs'],array('title'=>$song_title));
}
echo "<pre>";
print_r($songlistArr);
echo "</pre>";
}
}
$crawler = new MyCrawler();
// URL to crawl
$start_url="http://www.kugou.com/yy/special/index/1-0-2.html";
$crawler->setURL($start_url);
// Only receive content of files with content-type "text/html"
$crawler->addContentTypeReceiveRule("#text/html#");
//链接扩展
$crawler->addURLFollowRule("#http://www\.kugou\.com/yy/special/single/\d+\.html$# i");
$crawler->addURLFollowRule("#http://www.kugou\.com/yy/special/index/\d+-\d+-2\.html$# i");
// Store and send cookie-data like a browser does
$crawler->enableCookieHandling(true);
// Set the traffic-limit to 1 MB(1000 * 1024) (in bytes,
// for testing we dont want to "suck" the whole site)
//爬取大小无限制
$crawler->setTrafficLimit(0);
// Thats enough, now here we go
$crawler->go();
// At the end, after the process is finished, we print a short
// report (see method getProcessReport() for more information)
$report = $crawler->getProcessReport();
if (PHP_SAPI == "cli") $lb = "\n";
else $lb = "<br />";
echo "Summary:".$lb;
echo "Links followed: ".$report->links_followed.$lb;
echo "Documents received: ".$report->files_received.$lb;
echo "Bytes received: ".$report->bytes_received." bytes".$lb;
echo "Process runtime: ".$report->process_runtime." sec".$lb;
?>
PS：这里再为大家提供2款非常方便的正则表达式工具供大家参考使用：
JavaScript正则表达式在线测试工具：
http://tools.jb51.net/regex/javascript
正则表达式在线生成工具：
http://tools.jb51.net/regex/create_reg
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