CURL transfer and acquisition function_PHP tutorial

What is CURL?
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 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. Implement 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:
By default, PHP does not support CURL. 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 is to initialize with the cur_init() function
$curl = curl_init('www.php100.com')
2. Use the curl_setopt() function to set options.
3. After setting, execute the transaction curl_exec($curl);
4 Finally close curl_close();

Use PHP CURL to implement transmission and acquisition functions (post transmission method): obtain remote web page data
$user = "admin";
$pass = "admin100";
$curlPost = "user=$user&pass=$pass";
$ch = curl_init(); //Initialize a CURL object
curl_setopt($ch, CURLOPT_URL, "http://localhost/edu/login.php") ;
//Set the URL you need to crawl
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
//Set the curl parameters and ask whether the result is output to the screen. When it is true, it is not Return to the web page
Assuming that the above 0 is replaced by 1, then the next $data needs to be echoed.
curl_setopt($ch, CURLOPT_POST, 1);
//post submission
curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);

$data = curl_exec($ch);
//Run curl and request the web page.
curl_close($ch);
Realize the most basic part of remote simulated 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 the corresponding information even without logging into the php100 forum.
Analyze login fields--->Keep cookie status after logging in-->Read cookies and jump to relevant pages-->Catch number
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
The 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 names 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:

//Initialize a cURL object
$curl = curl_init();

//Set the URL you need to crawl
curl_setopt($curl, CURLOPT_URL, "http://www.baidu.com");

//Set cURL parameters and require the results to be saved in a string or output to the screen.
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 0);

//Run cURL and request the web page
$data = curl_exec($curl);

//Close URL request
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($_POST['user']=="admin"){
echo "<script>alert('success')</script>";
}else{
echo "<script>alert('failed')</script>";
}
//print_r($_POST);
?>

======

Simulated login code

pw_php100.php
$cookie_file=tempnam('./temp','cookie');
$login_url="http://bbs.php100.com/login.php";
$post_fields="cktime=3600&step=2&pwuser=php100&pwpwd=11111";
$ch=curl_init($login_url);
curl_setopt($ch, CURLOPT_URL, "http://www.baidu.com";
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
$data = curl_exec($ch);
curl_close($ch);

$url="http://bbs.php100.com/userpay.php";
$ch=curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
$contents = curl_exec($ch);
preg_match("/

金钱：

/",$contents,$arr);
echo $arr[1];
curl_close($ch);

?>

======

login.php

 print_r($_POST);

?>

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

curl.php

$curlPost = "user=$user&pass=$pass";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://localhost/edu/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);
?>

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