Introduction to PHP's cURL library and usage examples_PHP tutorial

Introduction and usage examples of PHP’s cURL library

This article mainly introduces the introduction and usage examples of PHP’s cURL library. Friends who need it can refer to it

Use PHP’s cURL library to crawl web pages simply and effectively. You only need to run a script and analyze the web pages you crawled, and then you can get the data you want programmatically. Whether you want to retrieve partial data from a link, take an XML file and import it into a database, or even simply retrieve the content of a web page, cURL is a powerful PHP library.

CURL function library (Client URL Library Function) in PHP

The code is as follows:

curl_close — close a curl session
curl_copy_handle — Copy all contents and parameters of a curl connection resource
curl_errno — Returns a numeric number containing error information for the current session
curl_error — Returns a string containing error information for the current session
curl_exec — Execute a curl session
curl_getinfo — Get information about a curl connection resource handle
curl_init — Initialize a curl session
curl_multi_add_handle — Add individual curl handle resources to a curl batch session
curl_multi_close — Close a batch handle resource
curl_multi_exec — Parse a curl batch handle
curl_multi_getcontent — Returns a text stream of fetched output
curl_multi_info_read — Get the relevant transmission information of the currently parsed curl
curl_multi_init — Initialize a curl batch handle resource
curl_multi_remove_handle — Remove a handle resource in the curl batch handle resource
curl_multi_select — Get all the sockets associated with the cURL extension, which can then be "selected"
curl_setopt_array — Set session parameters for a curl as an array
curl_setopt — Set session parameters for a curl
curl_version — Get curl-related version information
The function of the curl_init() function initializes a curl session. The only parameter of the curl_init() function is optional and represents a URL address.
The curl_exec() function is used to execute a curl session, and the only parameter is the handle returned by the curl_init() function.
The curl_close() function is used to close a curl session. The only parameter is the handle returned by the curl_init() function.

Example 1: Basic example

The code is as follows:

﹤?php
//Initialize a cURL object
$curl = curl_init();
//Set the URL you need to crawl
curl_setopt($curl, CURLOPT_URL, 'http://www.cmx8.cn');
//Set header
curl_setopt($curl, CURLOPT_HEADER, 1);
//Set cURL parameters to require the results to be saved in a string or output to the screen.
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
// Run cURL to request the web page
$data = curl_exec($curl);
// Close URL request
curl_close($curl);
// Display the obtained data
var_dump($data);
?>

Example 2: POST data

sendSMS.php, which can accept two form fields, one is the phone number and the other is the text message content.

The code is as follows:

﹤?php
$phoneNumber　='13812345678';
$message='This message was generated by curl and php';
$curlPost　='pNUMBER='　.urlencode($phoneNumber)　.'&MESSAGE='　.urlencode($message)　.'&SUBMIT=Send';
$ch　= curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.lxvoip.com/sendSMS.php');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
$data　= curl_exec();
curl_close($ch);
?﹥

Example 3: Using a proxy server

The code is as follows:

﹤?php　
$ch　= curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.cmx8.cn');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, 'proxy.lxvoip.com:1080');
curl_setopt($ch, CURLOPT_PROXYUSERPWD, 'user:password');
$data　= curl_exec();
curl_close($ch);
?﹥

Example 4: Simulated login

Curl simulates login discuz program, suitable for DZ7.0, just change username to your username and userpass to your password.

The code is as follows:

/**
* Curl simulated login discuz program
* The forum login function with verification code enabled has not yet been implemented
*/
!extension_loaded('curl') && die('The curl extension is not loaded.');
$discuz_url = 'http://www.lxvoip.com';//Forum address
$login_url = $discuz_url .'/logging.php?action=login';//Login page address
$get_url = $discuz_url .'/my.php?item=threads'; //My posts
$post_fields = array();
//The following two items do not need to be modified
$post_fields['loginfield'] = 'username';
$post_fields['loginsubmit'] = 'true';
//Username and password, must be filled in
$post_fields['username'] = 'lxvoip';
$post_fields['password'] = '88888888';
//Security question
$post_fields['questionid'] = 0;
$post_fields['answer'] = '';
//@todo verification code
$post_fields['seccoverify'] = '';
//Get form FORMHASH
$ch = curl_init($login_url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$contents = curl_exec($ch);
curl_close($ch);
preg_match('//i', $contents, $matches);
if(!empty($matches)) {
$formhash = $matches[1];
} else {
die('Not found the forumhash.');
}
//POST data, get COOKIE
$cookie_file = dirname(__FILE__) . '/cookie.txt';
//$cookie_file = tempnam('/tmp');
$ch = curl_init($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);
//Use the COOKIE obtained above to obtain the content of the page that needs to be logged in to view
$ch = curl_init($get_url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file);
$contents = curl_exec($ch);
curl_close($ch);
var_dump($contents);
?>

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