How PHP extends CURL

CURL is a file transfer tool that uses URL syntax to work in command line mode. It supports many protocols. It supports authentication functionality. It is commonly used in php to implement more complex transmission functions.

Functions implemented:

1. Realize remote acquisition and content collection

2. Realize FTP upload and download of PHP web version

3. Realize simulation Log in: Go to an email system, curl can simulate cookies

4, implement interface docking (API), data transmission, etc.: send text messages through a platform, capture and transfer the transmitted information.

5. Implement simulated cookies, etc.: Some attributes can only be operated when logged in.

How to use the CURL function:

By default, PHP does not support CURL. You need to enable this function in php.ini

;extension Remove the semicolon in front of =php_curl.dll

1 The first step in the entire operation process is to initialize with the cur_init() function

?

$curl = curl_init(‘www.php.cn')

3. After setting, Execute the transaction curl_exec($curl); 2. Use the curl_setopt() function to set options.

4 Finally close curl_close();

Use PHP CURL to implement transmission and acquisition functions (post transmission method): obtain remote web page data

$user = "admin";
$pass = "admin";
$curlPost= "user=$user&pass=$pass";
$ch = curl_init(); //初始化一个CURL对象
curl_setopt($ch, CURLOPT_URL,"http://localhost/edu/login.php");
//设置你所需要抓取的URL
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
//设置curl参数，要求结果是否输出到屏幕上，为true的时候是不返回到网页中
假设上面的0换成1的话，那么接下来的$data就需要echo一下。
curl_setopt($ch, CURLOPT_POST, 1);
//post提交
curl_setopt($ch, CURLOPT_POSTFIELDS,$curlPost);
$data = curl_exec($ch);
//运行curl,请求网页。
curl_close($ch);
[/code]

Realize remote simulation Log in to the most basic part.

curl still needs to configure the user name and password, but it is hidden by the browser.

============================================== ================================\

curl simulated login

Simulated login: You can still view the corresponding information even without logging in to the php100 forum.

Analyze login fields--->Keep cookies after logging in-->Read cookies and jump to relevant pages-->Catch number

1. After simulating login Create a file to save the cookie content

2. Simulate user login status by reading the generated cookie content

3. Go to the relevant page to obtain the required content

tempnameCreate a temporary File

tempnam() function creates a temporary file with a unique file name. If successful, the function returns the new temporary file name. On failure, returns false.

tempnam(dir,prefix)

Parameter Description

dir Required. Specifies the directory where temporary files are created.

prefix required. Specifies the beginning of the file name.

Equivalent to fopen → fwirte → fclose

It can return a Boolean value. It is very dangerous to use a third party to log in to your QQ and msn, because it can record your login status and capture your username and password.

Use CURL to simulate logging in to the PHP100 forum

1. Analyze the field name and number of required fields in the input box required for login

2. Save the cookie and obtain the number of member gold coins after simulating login.

Code:

//初始化一个 cURL 对象
$curl = curl_init();
//设置你需要抓取的URL
curl_setopt($curl, CURLOPT_URL," http://www.baidu.com ");
//设置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, 0);
//运行cURL，请求网页
$data = curl_exec($curl);
//关闭URL请求
curl_close($curl);
$user = "admin";
$pass = "admin100";
$curlPost= "user=$user&pass=$pass";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL," http://localhost/curl/login.php ");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$curlPost);
$data = curl_exec($ch);
curl_close($ch);
?>
if($_POST['user']=="admin"){
 echo"";
}else{
 echo"";
}
//print_r($_POST);
?>

Related recommendations:

Detailed explanation of the usage of PHP extension CURL

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