3 ways to implement data collection in PHP

What is collection? It is to use PHP programs to capture information from other websites into our own database and website. This article mainly shares with you three methods of data collection in PHP. I hope it can help you.

PHP production and collection technology:

From the underlying socket to the high-level file operation function, there are a total of 3 methods to achieve collection.

1. Use socket technology to collect:

Socket collection is the lowest level, it just establishes a long connection, and then we have to do it ourselves Construct the http protocol string to send the request.

1. <?php  
   //连接,$error错误编号,$errstr错误的字符串,30s是连接超时时间
   $fp=fsockopen("www.youku.com",80,$errno,$errstr,30);  
   if(!$fp) die("连接失败".$errstr);  
   //构造http协议字符串，因为socket编程是最底层的，它还没有使用http协议
   $http="GET /?spm=a2hww.20023042.topNav.5~1~3!2~A HTTP/1.1\r\n";   //  \r\n表示前面的是一个命令
   $http.="Host:www.youku.com\r\n";  //请求的主机
   $http.="Connection:close\r\n\r\n";   // 连接关闭，最后一行要两个\r\n
   //发送这个字符串到服务器
   fwrite($fp,$http,strlen($http));  
   //接收服务器返回的数据
   $data=&#39;&#39;;  
   while (!feof($fp)) {  
   $data.=fread($fp,4096);  //fread读取返回的数据，一次读取4096字节
   }  
   //关闭连接
   fclose($fp);  
   var_dump($data);  
   ?>

The printed result is as follows, including the returned header information and the source code of the page:

2. Use curl_a set of functions

curl encapsulates the HTTP protocol into many functions. Just pass the corresponding parameters directly, which reduces the difficulty of writing HTTP protocol strings.

Prerequisite: The curl extension must be enabled in php.ini.

1. //生成一个curl对象
   $curl=curl_init();  
   //设置URL和相应的选项
   curl_setopt($curl, CURLOPT_URL, "http://www.youku.com");  
   curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  //将curl_exec()获取的信息以字符串返回，而不是直接输出。
   //执行curl操作
   $data=curl_exec($curl);  
   var_dump($data);

The printed results are as follows, including only the source code of the page:

3. Use file_get_contents directly (the top level)

Prerequisite: Set the url address that allows opening a network in php.ini.

[php] view plain copy

1. //使用file_get_contents()
   $data=file_get_contents("http://www.youku.com");  
   var_dump($data);

Selection of 3 methods

The above three methods are mainly used for communication between networks. The latter two are more commonly used: if you want to collect a large amount of data in batches, use the second [CURL], which has good performance and stability.

Use the third method when sending a few requests occasionally but not frequently and intensively.

Extension: How to break the anti-leeching of pictures?

For example, the pictures on the 7060 website are protected from hotlinking: the pictures can be seen on his website, but cannot be accessed outside the site.

Principle: There is a referer item in the HTTP protocol, which represents the source address of the request. The server will determine if If this request is not from this website, it will be filtered out:

Solution: Simulate it yourself when sending HTTP Just referer:

Extension: Some data must be collected when you need to log in first. You can use the simulated trial simulation to log in. Collection under status:

a. First log in using browser. After logging in, there will be SESSIONID

b in the COOKIE of the browser. . When sending PHP to send HTTP protocol, put the SESSIONID in the browser into PHP's HTTP protocol request, so that the request is sent in the logged in state.

Summary: All data sent by the client can be simulated, so the program on the server must filter the client data where necessary.

When should I use the above? During interface development and collection.

2. Data collection

For example, I want to collect information about all American movies in this URL,

You must first know the structure of the node where the movie is located. We use firebug to view it.

Then start writing the code: The complete code is as follows

1. /**
    * 发一个GET请求获取数据
    */
   function get($url)  
   {  
      global $curl;  
      // 配置curl中的http协议->可配置的荐可以查PHP手册中的curl_
      curl_setopt($curl, CURLOPT_URL, $url);  
      curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);  
      curl_setopt($curl, CURLOPT_HEADER, FALSE);  
      // 执行这个请求
      return curl_exec($curl);  
   }  
   // 生成一个curl对象
   $curl = curl_init();  
   $url='http://list.youku.com/category/show/c_96_a_%E7%BE%8E%E5%9B%BD_s_1_d_1_p_3.html';  
   $data=get($url);  
   // 匹配电影所在位置
   $list_preg = &#39;/<li class="yk-col4 mr1">.+<\/li>/Us&#39;;  
   // 匹配img标签上的src和alt
   $img_preg = &#39;/<img class="quic" _src="(.*)" src="(.*)" alt="(.*)" \/>/U&#39;;  
   //匹配电影的url
   $video_preg=&#39;/<a href="(.*)" title="(.*)" target="(.*)"><\/a>/U&#39;;  
   //把所有的li存到$list里，$list是个二维数组
   preg_match_all($list_preg,$data,$list);  
      //var_dump($list);
   foreach ($list[0] as $k => $v) {   //这里$v就是每一个li标签
   /* 获取图片及电影名称
       preg_match($img_preg,$v,$img);  //把匹配到的图片的信息存到$img里
       var_dump($img);
       */
       /*获取电影地址
       preg_match($video_preg,$v,$video);  //把匹配到的电影的信息存到$video里
       var_dump($video);
   */
       preg_match($img_preg,$v,$img);  
       preg_match($video_preg,$v,$video);  
       echo $img[0].&#39;<a href="&#39;.$video[1].&#39;">&#39;.$video[2].&#39;</a>&#39;;  
   }

测试：

打印$list;

 

打印$img

 

打印$video

 

 

最终效果：

 

如果需要把图片拷贝到硬盘上，则在foreach循环里加上以下代码：

1. $imgData = get($img[1]);  
      // 把图片文件写到硬盘上【下载】
      // 因为操作系统是GBK的，所以要把UTF8转成GBK
      is_dir('./youkuimg/') ? '': mkdir('./youkuimg/');  
   file_put_contents('./youkuimg/'.mb_convert_encoding($img[3], 'gbk', 'utf-8').'.jpg', $imgData);

 

效果如下：在当前目录下的youkuimg目录下就会有下载好的图片。

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