PHP curl_setopt function simulates user login example

php The curl_setopt() function will set options for a CURL session. It is an important function in PHP. It can imitate some user behaviors, such as imitating user login, registration, etc. Some user-operable behaviors. This article will take you through an example of how to use the curl_setopt function in php to simulate user login. I hope it will be helpful for you to understand the curl_setopt() function.

Actual code plus code explanation is the best help for you to understand the php curl_setopt function simulated user login example:

First, let’s look at the login part of the code:

//模拟登录 
function login_post($url, $cookie, $post) { 
  $curl = curl_init();//初始化curl模块 
  curl_setopt($curl, CURLOPT_URL, $url);//登录提交的地址 
  curl_setopt($curl, CURLOPT_HEADER, 0);//是否显示头信息 
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 0);//是否自动显示返回的信息 
  curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie); //设置Cookie信息保存在指定的文件中 
  curl_setopt($curl, CURLOPT_POST, 1);//post方式提交 
  curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post));//要提交的信息 
  curl_exec($curl);//执行cURL 
  curl_close($curl);//关闭cURL资源，并且释放系统资源 
}

The function login_post() first initializes curl_init(), and then uses curl_setopt() to set relevant option information, including the URL address to be submitted, the saved cookie file, the post data (user name and password, etc.), and whether to return Information and so on, then curl_exec executes curl, and finally curl_close() releases the resources. Note that PHP's own http_build_query() can convert arrays into connected strings.

Next, if the login is successful, we need to obtain the page information after the login is successful.

//登录成功后获取数据 
function get_content($url, $cookie) { 
  $ch = curl_init(); 
  curl_setopt($ch, CURLOPT_URL, $url); 
  curl_setopt($ch, CURLOPT_HEADER, 0); 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
  curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie); //读取cookie 
  $rs = curl_exec($ch); //执行cURL抓取页面内容 
  curl_close($ch); 
  return $rs; 
}

The function get_content() also initializes curl first, then sets relevant options, executes curl, and releases resources. Among them, we set CURLOPT_RETURNTRANSFER to 1 to automatically return information, and CURLOPT_COOKIEFILE can read the cookie information saved when logging in, and finally return the page content.

Our ultimate goal is to obtain the information after simulated login, which is useful information that can only be obtained after successful normal login. Next, we take logging into the PHP Chinese website as an example to see how to capture the information after successful login.

//设置post的数据 
$post = array ( 
  'email' => 'oschina账户', 
  'pwd' => 'oschina密码', 
  'goto_page' => '/my', 
  'error_page' => '/login', 
  'save_login' => '1', 
  'submit' => '现在登录'
); 
 //登录地址 $url = "//m.sbmmt.com/action/user/login.html"; //设置cookie保存路径 $cookie = dirname(__FILE__) . '/cookie_oschina.txt'; //登录后要获取信息的地址 $url2 = "http://m.oschina.net/my"; //模拟登录 
login_post($url, $cookie, $post); //获取登录页的信息 $content = get_content($url2, $cookie); //删除cookie文件 
@ unlink($cookie); //匹配页面信息 $preg = "/<td class=&#39;portrait&#39;>(.*)<\/td>/i"; 
preg_match_all($preg, $content, $arr); $str = $arr[1][0]; //输出内容 echo $str;

Usage summary

1. Initialize curl;

2. Use curl_setopt to set the target url, and other options;

3. curl_exec, execute curl ;

4. After execution, close curl;

5. Output data.

【Recommended related articles】

1. Introduction to the concept and usage examples of php curl_setopt function

2.Use php curl_setopt() function A simple example of capturing web pages and POST data

3.Detailed usage example of PHP curl_exec function

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