PHP uses socket to simulate POST method

This article mainly introduces the method of PHP using sockets to simulate POST, and analyzes the common skills of sockets to simulate POST with examples. Friends in need can refer to it

Nearly all of the simulated POST requests we use most are I used php curl to implement it. I didn't consider that PHP socket can also be implemented. Today I saw a friend wrote an article. Now I will share with you an example of PHP socket simulating POST request.

In the past, I used PHP curl extension to simulate post requests. I never thought that PHP socket could also be implemented. I recently looked through the relevant information and found that it is not that profound, but I have never fully understood the principle and essence of post. In fact, it is to send a protocol string marked as post to the destination program as follows:

POST /Destination program url HTTP/1.1

Accept: Receive information format

Referer: URL source

Accept-Language: Accepting language

Content-Type: application/x-www-form-urlencoded

Cookie: Website cookie, I don’t need to explain too much, right?

User-Agent: User agent, operating system and version, CPU type, browser and version information

Host: The host address to be sent

Content-Length : The length of the sent data

Pragma: Whether there is a local cache

Cache-Control: Whether it is needed Web page cache

Connection: Connection status

username=fengdingbo&password=jb51.net //Data sent by post

I think everyone is most familiar with the post method of submitting data in forms. For example, when we want to send the username and password to a certain page, fill in the corresponding input box, click the submit button, and finally send the form. What goes to the action program is the above data. Knowing this, I think it is not difficult

At this time, we only need to use the php socket to open a port, such as port 80, and use this port to send the above information to the destination program.

How do we establish a socket channel on a port?

It’s so simple in PHP!

Official prototype:

resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string & $errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )

The following is human understanding:

fsockopen(host name, port number, error number The & variable, the & variable of the error prompt, the timeout time)
The host name is the destination you need to send data to;
The port number is the port on which the destination program will wait for your data;
Error The & variable of the number, this is the error number returned if the socket establishment is unsuccessful;
The & variable of the error prompt is the error prompt information returned when there is an error;
The timeout time is the error number returned by the other party after posting the data. No response to the message, the maximum time to wait.

If nothing unexpected happens (you correctly set the parameters of the fsockopen() function), a socket channel has now been opened. The next step we need to do is to post through this opened channel. The request protocol is sent to the destination program. At this time, you can use either fwrite or fputs function to send the post request format to the resource handle opened by fsockopen(). At this time, a great socket simulated post request is born.

The code is as follows

<?php
/**
 * SOCKET扩展函数
 * @copyright (c) 2013
 * @author Qiufeng <fengdingbo@gmail.com>
 * @link http://www.jb51.net
 * @version 1.0
 */
 
/**
 * Post Request
 *
 * @param string $url 
 * @param array $data
 * @param string $referer
 * @return array
 */
if ( ! function_exists(&#39;socket_post&#39;))
{
 function socket_post($url, $data, $referer=&#39;&#39;)
 {
 if( ! is_array($data))
 {
 return;
 }
 
 $data = http_build_query($data);
 $url = parse_url($url);
 
 if ( ! isset($url[&#39;scheme&#39;]) || $url[&#39;scheme&#39;] != &#39;http&#39;)
 {
 die(&#39;Error: Only HTTP request are supported !&#39;);
 }
 
 $host = $url[&#39;host&#39;];
 $path = isset($url[&#39;path&#39;]) ? $url[&#39;path&#39;] : &#39;/&#39;;
 
 // open a socket connection on port 80 - timeout: 30 sec
 $fp = fsockopen($host, 80, $errno, $errstr, 30);
 
 if ($fp)
 {
 // send the request headers:
 $length = strlen($data);
 $POST = <<<HEADER
POST {$path} HTTP/1.1
Accept: text/plain, text/html
Referer: {$referer}
Accept-Language: zh-CN,zh;q=0.8
Content-Type: application/x-www-form-urlencodem 
Cookie: token=value; pub_cookietime=2592000; pub_sauth1=value; pub_sauth2=value
User-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17
Host: {$host}
Content-Length: {$length}
Pragma: no-cache
Cache-Control: no-cache
Connection: closern
{$data}
HEADER;
 fwrite($fp, $POST);
 $result = &#39;&#39;;
 while(!feof($fp))
 {
 // receive the results of the request
 $result .= fread($fp, 512);
 }
 }
 else
 {
 return array(
  &#39;status&#39; => &#39;error&#39;,
  &#39;error&#39; => "$errstr ($errno)"
  );
 }
 
 // close the socket connection:
 fclose($fp);
 
 // split the result header from the content
 $result = explode("rnrn", $result, 2);
 
 // return as structured array:
 return array(
 &#39;status&#39; => &#39;ok&#39;,
 &#39;header&#39; => isset($result[0]) ? $result[0] : &#39;&#39;,
 &#39;content&#39; => isset($result[1]) ? $result[1] : &#39;&#39;
 );
 }
}
 
print_r(socket_post(&#39;http://www.jb51.net/&#39;, array(&#39;name=&#39;=>&#39;qiufeng&#39;,&#39;password&#39;=>md5(&#39;www.jb51.net&#39;))));
/* e.g: socket_post(&#39;http://www.jb51.net&#39;, array(&#39;name=&#39;=>&#39;qiufeng&#39;,&#39;password&#39;=>md5(&#39;jb51.net&#39;))); */
/* End of file socket_helper.php */

In fact, when the socket channel is opened, the COOKIE we pass is If it is correct, (the php code running in the screenshot comes from above, and my user name appears on the webpage returned after running, indicating that the other website has recognized that I have logged in) we can do many things, such as refreshing posts, replying, etc. You understand, right?

Okay, the above is not convincing enough. Let’s look at a php socket to implement image upload.

There are two points to note in this code:

First, it is an http post request;

The second is the form upload protocol,

The request string under

is suitable for any language.

The code is as follows

<?php 
 
  $remote_server = "jb51.net"; 
 
  $boundary = "---------------------".substr(md5(rand(0,32000)),0,10); 
   
  // Build the header 
  $header = "POST /api.php?action=twupload HTTP/1.0rn"; 
  $header .= "Host: {$remote_server}rn"; 
  $header .= "Content-type: multipart/form-data, boundary=$boundaryrn"; 
 
  /* 
  // attach post vars 
  foreach($_POST AS $index => $value){ 
   $data .="--$boundaryrn"; 
   $data .= "Content-Disposition: form-data; name="".$index.""rn"; 
   $data .= "rn".$value."rn"; 
   $data .="--$boundaryrn"; 
  } 
  */
  $file_name = "aaa.jpg"; 
  $content_type = "image/jpg"; 
 
  $data = &#39;&#39;; 
  // and attach the file 
  $data .= "--$boundaryrn"; 
 
  $content_file = file_get_contents(&#39;aaa.jpg&#39;); 
  $data .="Content-Disposition: form-data; name="userfile"; filename="$file_name"rn"; 
  $data .= "Content-Type: $content_typernrn"; 
  $data .= "".$content_file."rn"; 
  $data .="--$boundary--rn"; 
 
  $header .= "Content-length: " . strlen($data) . "rnrn"; 
     // Open the connection 
 
 
  $fp = fsockopen($remote_server, 80); 
  // then just 
  fputs($fp, $header.$data); 
  // reader 
 
 while (!feof($fp)) { 
  echo fgets($fp, 128); 
 } 
 
fclose($fp);

Summary: The above That’s the entire content of this article, I hope it will be helpful to everyone’s study.

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