以下是一个简单的PHP扩展爬虫的实例,我们将使用PHP的cURL库来发送HTTP请求,并使用正则表达式来解析网页内容。

实例描述

本实例将创建一个简单的PHP扩展爬虫,它能够:

实例php扩展爬虫,实例PHP扩展爬虫:实战教程与代码示例  第1张

1. 发送HTTP GET请求到指定的URL。

2. 解析返回的HTML内容。

3. 提取网页中的特定信息(例如,标题和链接)。

代码示例

```php

// 定义爬虫类

class SimpleCrawler {

private $url;

private $curl;

public function __construct($url) {

$this->url = $url;

$this->curl = curl_init();

}

public function fetch() {

curl_setopt($this->curl, CURLOPT_URL, $this->url);

curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);

curl_setopt($this->curl, CURLOPT_FOLLOWLOCATION, true);

curl_setopt($this->curl, CURLOPT_USERAGENT, 'SimpleCrawler/1.0');

$html = curl_exec($this->curl);

if (curl_errno($this->curl)) {

echo 'Curl error: ' . curl_error($this->curl);

return false;

}

curl_close($this->curl);

return $html;

}

public function extractTitles() {

$html = $this->fetch();

preg_match_all('/(.*?)<""/title>/si', $html, $matches);</p><p style="text-indent:2em;"> return $matches[1];</p><p style="text-indent:2em;"> }</p><p style="text-indent:2em;"> public function extractLinks() {</p><p style="text-indent:2em;"> $html = $this->fetch();</p><p style="text-indent:2em;"> preg_match_all('/<a""s+href="</p> </div> <div class="4e55f41bc2009334 copyright">本文由 @<a href="http://www.chizx.cn/author/19/" target="_blank">小念</a> 发布在 <a href="http://www.chizx.cn/" target="_blank">驰装修技术</a>,如有疑问,请联系我们。<br>文章链接:<a href="http://www.chizx.cn/article/NuaysT_UNaDEbKWCIIiCm" target="_blank">http://www.chizx.cn/article/NuaysT_UNaDEbKWCIIiCm</a></div> <div class="f41bc20093349bd3 post-user-meta"> <div class="c20093349bd30a64 user-meta-bg" style="background-image:url(http://www.chizx.cn/zb_users/theme/Jz52_bailu/images/about.jpg)"></div> <div class="93349bd30a645f61 user-meta-inner"> <a class="9bd30a645f6105af flex-avatar" href="http://www.chizx.cn/author/19/"><img 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