PHP Curl Library Explained

Introduction: This is the PHP Curl Library to explain the detailed page, introduced and PHP, related knowledge, skills, experience, and some PHP source code and so on.

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Using the PHP Curl Library, you can easily and effectively grab pages. You just need to run a script, then analyze the page you crawled, and then you can get the data you want in a program. Whether you want to take part of the data from a link, or take an XML file and import it into the database, the fear is simply to get the Web content, CURL is a powerful PHP library. This article mainly describes if you use this PHP library.

Enable CURL settings
First, we have to make sure that our PHP opens the library, and you can get this information by using the Php_info () function.

Phpinfo ();

If you can see the following output on a webpage, it means that the Curl Library is turned on.

If you see, then you need to set up your PHP and open the library. If you are under the Windows platform, then very simple, you need to change the settings of your php.ini file, find Php_curl.dll, and cancel the previous semicolon comment on the line. As shown below:

Cancel the comment under the Extension=php_curl.dll

If you are under Linux, then you need to recompile your PHP, edit, you need to open the compilation parameters-the Configure command to add the "? With-curl" parameter.

A small example
If everything is ready, here is a small routine:

Initialize a CURL object $curl = Curl_init (); Set the URL you need to crawl curl_setopt ($curl, Curlopt_url, ' http://coolshell.cn '); Set Header curl_setopt ($curl, Curlopt_header, 1); Sets the curl parameter, which requires the result to be saved to a string or output to the screen. curl_setopt ($curl, Curlopt_returntransfer, 1); Run Curl, request a Web page $data = curl_exec ($curl); Close URL Request Curl_close ($curl); Show the data obtained Var_dump ($data);

How to post data

The above is the code to crawl the Web page, the following is the post data to a page. Suppose we have a URL http://www.example.com/sendSMS.php that handles the form, which can accept two form fields, one is the phone number, and the other is the message content.

$phoneNumber = ' 13912345678 '; $message = ' This message is generated by curl and PHP '; $curlPost = ' pnumber= '. UrlEncode ($phoneNumber). ' &message= '. UrlEncode ($message). ' &submit=send '; $ch = Curl_init (); curl_setopt ($ch, Curlopt_url, ' http://www.example.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);

From the above program we can see that using Curlopt_post to set the HTTP protocol post method instead of the Get method, and then set the post data to Curlopt_postfields.

About proxy servers

The following is an example of how to use a proxy server. Please note that the highlighted code, the code is very simple, I will not have to say more.

$ch = Curl_init (); curl_setopt ($ch, Curlopt_url, ' http://www.example.com '); curl_setopt ($ch, Curlopt_header, 1); curl_setopt ($ch, Curlopt_returntransfer, 1); curl_setopt ($ch, Curlopt_httpproxytunnel, 1); curl_setopt ($ch, Curlopt_proxy, ' fakeproxy.com:1080 '); curl_setopt ($ch, curlopt_proxyuserpwd, ' User:password '); $data = Curl_exec (); Curl_close ($ch);

About SSL and cookies

About SSL is the HTTPS protocol, you just need to curlopt_url the connection of http://Into https://. Of course, there is also a parameter called Curlopt_ssl_verifyhost that can be set to verify the site.

For cookies, you need to understand the following three parameters:

Curlopt_cookie, set a cookie Curlopt_cookiejar in the face of the session, save a cookie Curlopt_cookiefile,cookie file when the session ends.

HTTP Server Authentication

Finally, let's look at the HTTP server Authentication scenario.

$ch = Curl_init (); curl_setopt ($ch, Curlopt_url, ' http://www.example.com '); curl_setopt ($ch, Curlopt_returntransfer, 1); curl_setopt ($ch, Curlopt_httpauth, Curlauth_basic); curl_setopt (Curlopt_userpwd, ' [Username]:[password] ') $data = Curl_exec (); Curl_close ($ch);

For more information, please refer to the relevant Curl Handbook.

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