Introduction to several methods of crawling pages with php curl_PHP Tutorial

Curl mainly captures data. Of course, we can use other methods to capture it, such as fsockopen, file_get_contents, etc. But it can only capture those pages that can be directly accessed. If you want to capture pages with page access control, or pages after logging in, it will be more difficult.

is to retrieve the PHP homepage and put it into a file.

Example 1. Use PHP's CURL module to retrieve the PHP homepage

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$ch = curl_init(); curl_setopt($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. Use a proxy to crawl

Why use a proxy to crawl Woolen cloth? Take Google as an example. If you capture Google's data very frequently in a short period of time, you won't be able to capture it. When Google restricts your IP address, you can change the proxy and crawl again.

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$ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "http://www.hzhuti.com"); 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, 'user:password');如果要密码的话，加上这个 $result=curl_exec($ch); curl_close($ch); ?>

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "http://www.hzhuti.com");

curl_setopt($ch, CURLOPT_HEADER, false);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, TRUE);

代码如下

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$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('name'=>serialize(array('tank','zhang')),'sex'=>1,'birth'=>'20101010')  *例如array('name'=>array('tank','zhang'),'sex'=>1,'birth'=>'20101010')这样会报错的*/  $data = array('name' => 'test', 'sex'=>1,'birth'=>'20101010');  curl_setopt($ch, CURLOPT_URL, 'http://localhost/mytest/curl/upload.php');  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 )

curl_setopt($ch, CURLOPT_PROXY , 125.21 .23.6:8080); //url_setopt($ch, CURLOPT_PROXYUSERPWD, 'user:password'); If you want a password, add this $result=curl_exec($ch); curl_close( $ch); ?> 3. After posting the data, grab the data Let’s talk about the data submission separately, because curl is used In many cases, there will be data interaction, so it is more important.

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$ch = curl_init();<🎜> /*It should be noted here that the data to be submitted cannot be a two-dimensional array or higher<🎜 > *For example array('name'=>serialize(array('tank','zhang')),'sex'=>1,'birth'=>'20101010') *For example array( 'name'=>array('tank','zhang'),'sex'=>1,'birth'=>'20101010') This will report an error*/ $data = array(' name' => 'test', 'sex'=>1,'birth'=>'20101010'); curl_setopt($ch, CURLOPT_URL, 'http://localhost/mytest/curl/upload .php'); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); curl_exec($ch); ?>In upload. In the php file, print_r($_POST); can use curl to grab the content Array output by upload.php ( [name] => test [sex] => 1 [birth] => 20101010 )

4. Grab some pages with page access control

3 methods of page access control

3 methods of page access control Zhang Published on 2010-10-12

Category: apache/nginx
We often see this phenomenon, see the picture below

apache page access control
Why should we carry out such control? Let different people see different things and protect information. Although this kind of protection is relatively low-level, it is still somewhat useful.

1. Use the htpasswd command to generate a permission control file

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代码如下

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查看复制打印? 1.[zhangy@BlackGhost test]$ htpasswd -c ./access tank  //生成一个密码文件 ，-c是新建一个文件  htpasswd -h可查看   2.New password:            //提示输入密码   3.Re-type new password:        //重复密码   4.Adding password for user tank   5.[zhangy@BlackGhost test]$ cat access    //查看一下密码文件   6.tank:Uj5B3qIF/BNdI      //用户名是明文的，密码是加密的。  [zhangy@BlackGhost test]$ htpasswd -c ./access tank  //生成一个密码文件 ，-c是新建一个文件  htpasswd -h可查看 New password:            //提示输入密码 Re-type new password:        //重复密码 Adding password for user tank [zhangy@BlackGhost test]$ cat access    //查看一下密码文件 tank:Uj5B3qIF/BNdI      //用户名是明文的，密码是加密的。到这儿密码文件是生成好了。

View copy and print?

1.[zhangy@BlackGhost test]$ htpasswd -c ./access tank / /Generate a password file, -c is to create a new file htpasswd -h can be viewed

2.New password: Adding password for user tank

5.[zhangy@BlackGhost test]$ cat access //Check the password file

6.tank:Uj5B3qIF/BNdI //The username is in clear text and the password is encrypted.

[zhangy@BlackGhost test]$ htpasswd -c ./access tank //Generate a password file, -c is to create a new file htpasswd -h can be viewed

New password: //Prompt for password

代码如下

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listen 10004 NameVirtualHost *:10004  DocumentRoot "/home/zhangy/www/test"  ServerName *:10004  BandwidthModule On  ForceBandWidthModule On  Bandwidth all 1024000  MinBandwidth all 50000  LargeFileLimit * 500 50000  MaxConnection all 2  ErrorLog "/home/zhangy/apache/blog.51yip.com.com-error.log"  CustomLog "/home/zhangy/apache/blog.51yip.com-access.log" common //看一下，下面的配置    AuthType Basic  AuthName "access test"  AuthUserFile /home/zhangy/www/test/access  Require valid-user

Re -type new password: //Repeat password

Adding password for user tank

[zhangy@BlackGhost test]$ cat access //Check the password file

tank:Uj5B3qIF/BNdI //The user name is in clear text , the password is encrypted. At this point the password file is generated.

代码如下	复制代码
[zhangy@BlackGhost test]$ vi .htaccess //打开个文件 ，添加权限内容 [zhangy@BlackGhost test]$ cat .htaccess //下面就是.htaccess的内容  AuthType Basic  AuthName "access test"  AuthUserFile /home/zhangy/www/test/access  Require valid-user

Second, page access control method 1, which can be configured by modifying httpd.conf or httpd-vhosts.conf

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listen 10004NameVirtualHost *:10004 DocumentRoot "/home/zhangy/www/test" ServerName *:10004 BandwidthModule On ForceBandWidthModule On Bandwidth all 1024000 MinBandwidth all 50000 LargeFileLimit * 500 50000 MaxConnection all 2 ErrorLog "/home/ zhangy/apache/blog.51yip.com.com-error.log" CustomLog "/home/zhangy/apache/blog.51yip.com-access.log" common//Look at the following configuration AuthType Basic AuthName "access test" AuthUserFile /home/zhangy/www/test/access Require valid-user

2, we can use .htaccess file to control Create a .htaccess file under the root directory of test

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[zhangy@BlackGhost test]$ vi .htaccess   //Open a file and add permission content [zhangy@BlackGhost test]$ cat .htaccess  //The following is the content of .htaccess AuthType Basic AuthName "access test" AuthUserFile /home/zhangy/www/test/access Require valid-user

3，不用密码文件，也可以进行访问控制

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define('ADMIN_USERNAME','tank'); // Admin Username define('ADMIN_PASSWORD','tank'); // Admin Password //log check if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']) ||  $_SERVER['PHP_AUTH_USER'] != ADMIN_USERNAME ||$_SERVER['PHP_AUTH_PW'] != ADMIN_PASSWORD) {  Header("WWW-Authenticate: Basic realm="access test"");  Header("HTTP/1.0 401 Unauthorized");  echo <<<EOB  <html><body>  <h1>Rejected!</h1>  <big>Wrong Username or Password!</big>  </body></html> EOB;  exit; }

curl相关函数列表:

curl_init — 初始化一个CURL会话
curl_setopt — 为CURL调用设置一个选项
curl_exec — 执行一个CURL会话
curl_close — 关闭一个CURL会话
curl_version — 返回当前CURL版本
curl_init — 初始化一个CURL会话
描述
int curl_init ([string url])
curl_init()函数将初始化一个新的会话，返回一个CURL句柄供 curl_setopt(), curl_exec(),和 curl_close() 函数使用。如果可选参数被提供，那么CURLOPT_URL选项将被设置成这个参数的值。你可以使用curl_setopt()函数人工设置。

例 1. 初始化一个新的CURL会话，且取回一个网页

代码如下	复制代码
$ch = curl_init(); curl_setopt ($ch, CURLOPT_URL, “http://www.zend.com/”); curl_setopt ($ch, CURLOPT_HEADER, 0); curl_exec ($ch); curl_close ($ch); ?>

http://www.bkjia.com/PHPjc/444653.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/444653.htmlTechArticlecurl主要是抓取数据，当然我们可以用其他的方法来抓取，比如fsockopen,file_get_contents等。但是只能抓那些能直接访问的页面，如果要抓取有页...