how does integrate paypal ipn class example using php[Solved]

Hello Guy i have integrated in my application "paypal ipn" you can find out the way how to integrate to your application 

i think you can do, hope help you :)

<?php
class paypal_ipn_handler {

   var $last_error;                 // holds the last error encountered
   var $ipn_log;                    // bool: log IPN results to text file?
   var $ipn_log_file;               // filename of the IPN log
   var $ipn_response;               // holds the IPN response from paypal
   var $ipn_data = array();         // array contains the POST values for IPN
   var $fields = array();           // array holds the fields to submit to paypal
   var $sandbox_mode = false;

   function paypal_ipn_handler()
    {
        $this->paypal_url = 'https://www.paypal.com/cgi-bin/webscr';
       $this->last_error = '';
       $this->ipn_log_file = WP_ESTORE_PATH.'ipn_handle_debug.log';
       $this->ipn_response = '';
    }
 
 
  function formatMoney($number, $fractional=false)
     { 
  if ($fractional) { 
   $number = sprintf('%.2f', $number); 
  } 
  while (true) { 
   $replaced = preg_replace('/(-?\d+)(\d\d\d)/', '$1,$2', $number); 
   if ($replaced != $number) { 
    $number = $replaced; 
   } else { 
    break; 
   } 
  } 
  return $number; 
 } 
   function validate_ipn()
    {
      // parse the paypal URL
      $url_parsed=parse_url($this->paypal_url);

      // generate the post string from the _POST vars aswell as load the _POST vars into an arry
      $post_string = '';
      foreach ($_POST as $field=>$value) {
         $this->ipn_data["$field"] = $value;
         $post_string .= $field.'='.urlencode(stripslashes($value)).'&';
      }

      $this->post_string = $post_string;
      $this->debug_log('Post string : '. $this->post_string,true);

      $post_string.="cmd=_notify-validate"; // append ipn command

      // open the connection to paypal
      if($this->sandbox_mode){//connect to PayPal sandbox
       $uri = 'ssl://'.$url_parsed['host'];
       $port = '443';          
       $fp = fsockopen($uri,$port,$err_num,$err_str,30);
      }
      else{//connect to live PayPal site using standard approach
       $fp = fsockopen($url_parsed['host'],"80",$err_num,$err_str,30);
      }
      
      if(!$fp)
      {
         // could not open the connection.  If loggin is on, the error message
         // will be in the log.
         $this->debug_log('Connection to '.$url_parsed['host']." failed. fsockopen error no. $errnum: $errstr",false);
         return false;

      }
      else
      {
         // Post the data back to paypal
         fputs($fp, "POST $url_parsed[path] HTTP/1.1\r\n");
         fputs($fp, "Host: $url_parsed[host]\r\n");
         fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
         fputs($fp, "Content-length: ".strlen($post_string)."\r\n");
         fputs($fp, "Connection: close\r\n\r\n");
         fputs($fp, $post_string . "\r\n\r\n");

         // loop through the response from the server and append to variable
         while(!feof($fp)) {
            $this->ipn_response .= fgets($fp, 1024);
         }

         fclose($fp); // close connection

         $this->debug_log('Connection to '.$url_parsed['host'].' successfuly completed.',true);
      }

      if (eregi("VERIFIED",$this->ipn_response))
      {
         // Valid IPN transaction.
         $this->debug_log('IPN successfully verified.',true);
         return true;

      }
      else
      {
         // Invalid IPN transaction.  Check the log for details.
         $this->debug_log('IPN validation failed.',false);
         return false;
      }
   }
   
     function validate_and_dispatch_product()
    {
 
   
 
   //do print your paypal ipn_data array
   $this->debug_log(print_r($this->ipn_data),true);
 

   
           
     return true;
    }

  function debug_log($message,$success,$end=false)
    {
      if (!$this->ipn_log) return;  // is logging turned off?

      // Timestamp
      $text = '['.date('m/d/Y g:i A').'] - '.(($success)?'SUCCESS :':'FAILURE :').$message. "\n";

      if ($end) {
       $text .= "\n------------------------------------------------------------------\n\n";
      }
      // Write to log
      $fp=fopen($this->ipn_log_file,'a');
      fwrite($fp, $text );
      fclose($fp);
   }
   
   
    
}

// Start of IPN handling (script execution)
$ipn_handler_instance = new paypal_ipn_handler();

if ($ipn_handler_instance->validate_ipn())
{
 $ipn_handler_instance->debug_log('Creating product Information to send.',true);

      if(!$ipn_handler_instance->validate_and_dispatch_product())
      {
          $ipn_handler_instance->debug_log('IPN product validation failed.',false);
      } 
}