Detailed explanation of the usage of PHP extension CURL

Functions implemented:

1. Realize remote acquisition and collection of content

2. Realize FTP upload and download of PHP web version

3. Realize simulated login: go to an email system, curl can simulate cookies

4. Realize interface Docking (API), data transmission, etc.: Send text messages through a platform, capture and transmit the transmitted information.

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

How to use the CURL function:

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

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

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

$curl = curl_init(‘www.php.cn')

2. Use the curl_setopt() function to set options.

3. After setting, execute the transaction curl_exec($curl);

4 Finally close curl_close();

Use PHP CURL to realize the transmission and acquisition function (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]

implement remote Simulate the most basic part of login.

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

================================================== ============================

curl simulated login

simulated login: you can still view it even without logging in to the php100 forum corresponding information.

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

1. Create a file to save cookie content after simulating login

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

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

tempname creates 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 input box field name and number of fields required for login

2. Save the cookie and get the number of member gold coins after simulated 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);
?>

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