Doing POST Request by Socket Connection

This example of code shows how to do a simple POST request in PHP to another web server by using a socket connection.

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  1. <?php          
  2. // submit these variables to the server
  3. $post_data = array("test"=>"yes", "passed"=>"yes", "id"=>"3");
  4.  
  5. // send a request to specified server
  6. $result = do_post_request("http://www.example.com/", $post_data);
  7. if($result["status"] == "ok"){
  8.     // headers
  9.     echo $result["header"];
  10.     // result of the request
  11.     echo $result["content"];
  12. }else{
  13.     echo "An error occurred: ".$result["error"];
  14. }
  15.  
  16. function do_post_request($url, $data, $referer = ""){
  17.     // convert the data array into URL Parameters like a=1&b=2 etc.
  18.     $data = http_build_query($data);
  19.     // parse the given URL
  20.     $url = parse_url($url);
  21.    
  22.     if($url["scheme"] != "http"){
  23.         die("Error: only HTTP requests supported!");
  24.     }
  25.  
  26.     // extract host and path from url
  27.     $host = $url["host"];
  28.     $path = $url["path"];
  29.  
  30.     // open a socket connection with port 80, set timeout 40 sec.
  31.     $fp = fsockopen($host, 80, $errno, $errstr, 40);
  32.     $result = "";
  33.  
  34.     if($fp){
  35.         // send a request headers
  36.         fputs($fp, "POST $path HTTP/1.1\r\n");
  37.         fputs($fp, "Host: $host\r\n");
  38.         if($referer != "") fputs($fp, "Referer: $referer\r\n");
  39.         fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
  40.         fputs($fp, "Content-length: ".strlen($data)."\r\n");
  41.         fputs($fp, "Connection: close\r\n\r\n");
  42.         fputs($fp, $data);
  43.        
  44.         // receive result from request
  45.         while(!feof($fp)) $result .= fgets($fp, 128);
  46.     }else{
  47.         return array("status"=>"err", "error"=>"$errstr ($errno)");
  48.     }
  49.  
  50.     // close socket connection
  51.     fclose($fp);
  52.  
  53.     // split result header from the content
  54.     $result = explode("\r\n\r\n", $result, 2);
  55.  
  56.     $header = isset($result[0]) ? $result[0] : "";
  57.     $content = isset($result[1]) ? $result[1] : "";
  58.  
  59.     // return as structured array:
  60.     return array(
  61.         "status" => "ok",
  62.         "header" => $header,
  63.         "content" => $content
  64.     );
  65. }
  66.  
  67. ?>
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