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PHP cURL的详细使用手册

Jun 13, 2016 am 11:09 AM
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使用PHP cURL可以简单和有效地去抓网页。你只需要运行一个脚本,然后分析一下你所抓取的网页,然后就可以以程序的方式得到你想要的数据了。无论是你想从从一个链接上取部分数据,或是取一个XML文件并把其导入数据库,那怕就是简单的获取网页内容,PHP cURL是一个功能强大的PHP库。本文主要讲述如果使用这个PHP库。

启用PHP cURL设置

首先,我们得先要确定我们的PHP是否开启了这个库,你可以通过使用php_info()函数来得到这一信息。

﹤?phpphpinfo();?﹥
 

如果你可以在网页上看到下面的输出,那么表示PHP cURL库已被开启。

如果你看到的话,那么你需要设置你的PHP并开启这个库。如果你是在Windows平台下,那么非常简单,你需要改一改你的php.ini文件的设置,找到php_curl.dll,并取消前面的分号注释就行了。如下所示:

//取消下在的注释extension=php_curl.dll
 

如果你是在Linux下面,那么,你需要重新编译你的PHP了,编辑时,你需要打开编译参数——在configure命令上加上“–with-curl” 参数。

一个小示例

如果一切就绪,下面是一个小例程:

﹤?php
// 初始化一个PHP cURL对象
$curl = curl_init();

// 设置你需要抓取的URL
curl_setopt($curl, CURLOPT_URL, 'http://cocre.com');

// 设置header
curl_setopt($curl, CURLOPT_HEADER, 1);

// 设置PHP cURL参数,要求结果保存到字符串中还是输出到屏幕上。
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

// 运行cURL,请求网页
$data = curl_exec($curl);

// 关闭URL请求
curl_close($curl);

// 显示获得的数据
var_dump($data);
 

如何POST数据

上面是抓取网页的代码,下面则是向某个网页POST数据。假设我们有一个处理表单的网址http://www.example.com/sendSMS.php,其可以接受两个表单域,一个是电话号码,一个是短信内容。


 

<ol class="dp-xml">
<li class="alt"><span><span>﹤ ?php  </span></span></li>
<li>
<span>$</span><span class="attribute">phoneNumber</span><span> = </span><span class="attribute-value">'13912345678'</span><span>;  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">message</span><span> = </span><span class="attribute-value">'This message was generated by curl and php'</span><span>;</span>
</li>
<li class="alt">
<span>$</span><span class="attribute">curlPost</span><span> = </span><span class="attribute-value">'pNUMBER='</span><span> . urlencode($phoneNumber) . </span>
</li>
<li class="alt">
<span>'&</span><span class="attribute">MESSAGE</span><span>=</span><span class="attribute-value">' . urlencode($message) . </span>
</li>
<li class="alt">
<span class="attribute-value">'</span><span>&</span><span class="attribute">SUBMIT</span><span>=</span><span class="attribute-value">Send</span><span>';  </span>
</li>
<li>
<span>$</span><span class="attribute">ch</span><span> = </span><span class="attribute-value">curl_init</span><span>();  </span>
</li>
<li class="alt"><span>curl_setopt($ch, CURLOPT_URL, <br>'http://www.example.com/sendSMS.php');  </span></li>
<li><span>curl_setopt($ch, CURLOPT_HEADER, 1);  </span></li>
<li class="alt"><span>curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  </span></li>
<li><span>curl_setopt($ch, CURLOPT_POST, 1);  </span></li>
<li class="alt">
<span>curl_setopt($ch, CURLOPT_POSTFIELDS, <br>$curlPost);$</span><span class="attribute">data</span><span> = </span><span class="attribute-value">curl_exec</span><span>();  </span>
</li>
<li><span>curl_close($ch);  </span></li>
<li class="alt"><span>?﹥ </span></li>
</ol>

从上面的程序我们可以看到,使用CURLOPT_POST设置HTTP协议的POST方法,而不是GET方法,然后以CURLOPT_POSTFIELDS设置POST的数据。

关于代理服务器

下面是一个如何使用代理服务器的示例。请注意其中高亮的代码,代码很简单,我就不用多说了。

<ol class="dp-xml">
<li class="alt"><span><span>﹤ ?php $</span><span class="attribute">ch</span><span> = </span><span class="attribute-value">curl_init</span><span>();  </span></span></li>
<li><span>curl_setopt($ch, CURLOPT_URL, <br>'http://www.example.com');  </span></li>
<li class="alt"><span>curl_setopt($ch, CURLOPT_HEADER, 1);  </span></li>
<li><span>curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  </span></li>
<li class="alt"><span>curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);  </span></li>
<li><span>curl_setopt($ch, CURLOPT_PROXY, <br>'fakeproxy.com:1080');  </span></li>
<li class="alt"><span>curl_setopt($ch, CURLOPT_PROXYUSERPWD, <br>'user:password');  </span></li>
<li>
<span>$</span><span class="attribute">data</span><span> = </span><span class="attribute-value">curl_exec</span><span>();  </span>
</li>
<li class="alt"><span>curl_close($ch);  </span></li>
<li><span>?﹥  </span></li>
</ol>

关于其它更多的内容,请参看相关的PHP cURL手册。
 


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