, What is CURL and what functions can it achieve?
What is CURL
curl is a file transfer tool that uses URL syntax to work in command line mode. It supports many protocols: FTP, FTPS, HTTP, HTTPS, GOPHER, TELNET, DICT, FILE and LDAP. Curl also supports HTTPS authentication, HTTP POST method, HTTP PUT method, FTP upload, HTTP upload, proxy server, cookies, username/password authentication, download file breakpoint resuming, etc. It is very powerful.
Those functions commonly used in PHP are:
1. Realize remote acquisition and collection of content
2. Implement FTP upload and download of PHP web version
3. Implement simulated login
4. Implement interface docking (API), data transmission, etc.
5. Implement simulated cookies, etc.
2. How to use CURL function in PHP
1 The first step in the entire operation process is to initialize with the cur_init() function
$curl = curl_init(‘www.php100.com’);
2 Then, use the curl_setopt() function to set the options.
3 After setting, execute the transaction curl_exec($curl);
4 Finally close curl_close();
3. Use PHP CURL to implement transmission and acquisition functions
$curl = curl_init(); //Initialize a cURL object
curl_setopt($curl, CURLOPT_URL, "http://www.php100.com");
//Set the URL you need to crawl
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
//Set cURL parameters and require the results to be saved in a string or output to the screen.
$data = curl_exec($curl); //Run cURL and request the web page
curl_close($curl); //Close URL request
===========
$user = "admin";
$pass = "admin100";
$curlPost = "user=$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);
1. CURL simulated login process and steps
2. tempnam creates a temporary file
3. Use CURL to simulate logging in to the bkJia forum
$cookie_file = tempnam('./temp','cookie');
$login_url = 'http://bbs.php100.com/login.php';
$post_fields = 'cktime=31536000&step=2&pwuser=php100-88&pwpwd=111111';
$ch = curl_init($login_url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
curl_exec($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("/
?????(.*)/",$contents,$arr);
echo $arr[1];
curl_close($ch);
?>
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