5 commonly used examples of curl in php

1，抓取无访问控制文件

  <?php 
     $ch= curl_init(); 
     curl_setopt($ch, CURLOPT_URL,"http://localhost/mytest/phpinfo.php"); 
     curl_setopt($ch, CURLOPT_HEADER, false); 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//如果把这行注释掉的话，就会直接输出 
     $result=curl_exec($ch); 
     curl_close($ch); 
   ?>

2，使用代理进行抓取

 为什么要使用代理进行抓取呢？以google为例吧，如果去抓google的数据，短时间内抓的很频繁的话，你就抓取不到了。google对你的ip地址做限制这个时候，你可以换代理重新抓。

<?php 
     $ch= curl_init(); 
     curl_setopt($ch, CURLOPT_URL,"http://www.php.cn"); 
     curl_setopt($ch, CURLOPT_HEADER, false); 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
     curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, TRUE); 
     curl_setopt($ch, CURLOPT_PROXY, 125.21.23.6:8080); 
     //url_setopt($ch, CURLOPT_PROXYUSERPWD, &#39;user:password&#39;);如果要密码的话，加上这个 
     $result=curl_exec($ch); 
     curl_close($ch); 
?>

3，post数据后，抓取数据

 单独说一下数据提交数据，因为用 curl的时候，很多时候会有数据交互的，所以比较重要的。

   <?php 
     $ch= curl_init(); 
     /*在这里需要注意的是，要提交的数据不能是二维数组或者更高
     *例如array(&#39;name&#39;=>serialize(array(&#39;tank&#39;,&#39;zhang&#39;)),&#39;sex&#39;=>1,&#39;birth&#39;=>&#39;20101010&#39;)
     *例如array(&#39;name&#39;=>array(&#39;tank&#39;,&#39;zhang&#39;),&#39;sex&#39;=>1,&#39;birth&#39;=>&#39;20101010&#39;)这样会报错的*/ 
     $data=array(&#39;name&#39;=>&#39;test&#39;,&#39;sex&#39;=>1,&#39;birth&#39;=>&#39;20101010&#39;); 
     curl_setopt($ch, CURLOPT_URL,&#39;http://localhost/mytest/curl/upload.php&#39;); 
     curl_setopt($ch, CURLOPT_POST, 1); 
     curl_setopt($ch, CURLOPT_POSTFIELDS,$data); 
     curl_exec($ch); 
   ?>

 在 upload.php文件中，print_r($_POST);利用curl就能抓取出upload.php输出的内容Array ( [name] => test [sex] => 1 [birth] => 20101010 )

4，抓取一些有页面访问控制的页面

 以前写过一篇，页面访问控制的3种方法有兴趣的可以看一下。

 如果用上面提到的方法抓的话，会报以下错误

 You are not authorized to view this page

Youdonot have permission to view this directoryorpage using the credentials that you supplied because your Web browser is sending a WWW-Authenticate header field that the Web server is not configured to accept.

 这个时候，我们就要用CURLOPT_USERPWD来进行验证了

<?php 
     $ch= curl_init(); 
     curl_setopt($ch, CURLOPT_URL,"http://phpcn"); 
     /*CURLOPT_USERPWD主要用来破解页面访问控制的
     *例如平时我们所以htpasswd产生页面控制等。*/ 
     //curl_setopt($ch, CURLOPT_USERPWD, &#39;231144:2091XTAjmd=&#39;); 
     curl_setopt($ch, CURLOPT_HTTPGET, 1); 
     curl_setopt($ch, CURLOPT_REFERER,"http://club-china"); 
     curl_setopt($ch, CURLOPT_HEADER, 0); 
     $result=curl_exec($ch); 
     curl_close($ch); 
?>

5，模拟登录到sina

 我们要抓取数据，可能是登录以后的内容，这个时候我们就要用到curl的模拟登录功能了。

<?php  
       
    functionchecklogin($user,$password) 
     { 
     if( emptyempty($user) || emptyempty($password) ) 
     { 
     return0; 
     } 
     $ch= curl_init( ); 
     curl_setopt($ch, CURLOPT_REFERER,"http://mail.sina.com.cn/index.html"); 
     curl_setopt($ch, CURLOPT_HEADER, true ); 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true ); 
     curl_setopt($ch, CURLOPT_USERAGENT, USERAGENT ); 
     curl_setopt($ch, CURLOPT_COOKIEJAR, COOKIEJAR ); 
     curl_setopt($ch, CURLOPT_TIMEOUT, TIMEOUT ); 
     curl_setopt($ch, CURLOPT_URL,"http://mail.sina.com.cn/cgi-bin/login.cgi"); 
     curl_setopt($ch, CURLOPT_POST, true ); 
     curl_setopt($ch, CURLOPT_POSTFIELDS,"&logintype=uid&u=".urlencode($user)."&psw=".$password); 
     $contents= curl_exec($ch); 
     curl_close($ch); 
     if( !preg_match("/Location: (.*)\\/cgi\\/index\\.php\\?check_time=(.*)\n/",$contents,$matches) ) 
     { 
     return0; 
     }else{ 
     return1; 
     } 
     }  
       
     define("USERAGENT",$_SERVER[&#39;HTTP_USER_AGENT&#39;] ); 
     define("COOKIEJAR", tempnam("/tmp","cookie") ); 
     define("TIMEOUT", 500 );  
       
     echochecklogin("zhangying215","xtaj227"); 
     ?> 
 
打开/tmp下面的cookie文件看一下
 
# Netscape HTTP Cookie File
# http://curl.haxx.se/rfc/cookie_spec.html
# This file was generated by libcurl! Edit at your own risk.
 
mail.sina.com.cn    FALSE    /    FALSE    0    SINAMAIL-WEBFACE-SESSID    65223c4bd8900284ed463d2a3e1ac182
#HttpOnly_.sina.com.cn    TRUE    /    FALSE    0    SUE    es%3D8d96db0820c6c79922ad57d422f575e8%26ev%3Dv0%26es2%3Dcddfb8400dc5ca95902367ddcd7f57dd
.sina.com.cn    TRUE    /    FALSE    0    SUP    cv%3D1%26bt%3D1286900433%26et%3D1286986833%26lt%3D1%26uid%3D1445632344%26user%3D%25E5%25BC%25A0%25E6%2598%25A02001%26ag%3D2%26name%3Dzhangying20015%2540sina.com%26nick%3D%25E5%25BC%25A0%25E6%2598%25A02001%26sex%3D1%26ps%3D0%26email%3Dzhangying20015%2540sina.com%26dob%3D1982-07-18
#HttpOnly_.sina.com.cn    TRUE    /    FALSE    0    SID    BihcallomxMx-QZxzGrOlcSQx%2F0B%2F0cmr.NyQ%2F0B%2FcmGGalmarlmcHrcGlSmrmxmfxal_CBZ%2F_afugCmmGirBYHm0Bc%40fr5ciZiGG5i
#HttpOnly_.sina.com.cn    TRUE    /    FALSE    0    SPRIAL    bfb4102951fd5892a3fd5b42d442cd26
#HttpOnly_.sina.com.cn    TRUE    /    FALSE    0    SINA_USER    %D5%C5%D2001