Paypal Intergration

@shrikrishnatechDec 17.2010 — #Try this
[CODE]<?php 
 
 class paypal_class { 
 
 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 
 
 
 function paypal_class() { 
 
   // initialization constructor.  Called when class is created. 
 
   $this->paypal_url = 'https://www.paypal.com/cgi-bin/webscr'; 
 
   $this->last_error = ''; 
 
   $this->ipn_log_file = 'ipn_log.txt'; 
   $this->ipn_log = true; 
   $this->ipn_response = ''; 
 
   // populate $fields array with a few default values.  See the paypal 
   // documentation for a list of fields and their data types. These defaul 
   // values can be overwritten by the calling script. 
 
   $this->add_field('rm','2');           // Return method = POST 
   $this->add_field('cmd','_xclick'); 
 
 } 
 
 function add_field($field, $value) { 
 
   // adds a key=>value pair to the fields array, which is what will be 
   // sent to paypal as POST variables.  If the value is already in the 
   // array, it will be overwritten. 
 
   $this->fields["$field"] = $value; 
 } 
 
 function submit_paypal_post() { 
 
   // this function actually generates an entire HTML page consisting of 
   // a form with hidden elements which is submitted to paypal via the 
   // BODY element's onLoad attribute.  We do this so that you can validate 
   // any POST vars from you custom form before submitting to paypal.  So 
   // basically, you'll have your own form which is submitted to your script 
   // to validate the data, which in turn calls this function to create 
   // another hidden form and submit to paypal. 
 
   // The user will briefly see a message on the screen that reads: 
   // "Please wait, your order is being processed..." and then immediately 
   // is redirected to paypal. 
 
   echo "<html>n"; 
   echo "<head><title>Processing Payment...</title></head>n"; 
   echo "<body onLoad="document.form.submit();">n"; 
   echo "<center><h3>Please wait, your order is being processed...</h3></center>n"; 
   echo "<form method="post" name="form" action="".$this->paypal_url."">n"; 
 
   foreach ($this->fields as $name => $value) { 
   echo "<input type="hidden" name="$name" value="$value">"; 
   } 
 
   echo "</form>n"; 
   echo "</body></html>n"; 
 
 } 
 
 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 so we can play with them from the calling 
   // script. 
   $post_string = ''; 
   foreach ($_POST as $field=>$value) { 
   $this->ipn_data["$field"] = $value; 
   $post_string .= $field.'='.urlencode($value).'&'; 
   } 
   $post_string.="cmd=_notify-validate"; // append ipn command 
 
   // open the connection to paypal 
   $fp = fsockopen($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->last_error = "fsockopen error no. $errnum: $errstr"; 
   $this->log_ipn_results(false); 
   return false; 
 
   } else { 
 
   // Post the data back to paypal 
   fputs($fp, "POST $url_parsed[path] HTTP/1.1rn"); 
   fputs($fp, "Host: $url_parsed[host]rn"); 
   fputs($fp, "Content-type: application/x-www-form-urlencodedrn"); 
   fputs($fp, "Content-length: ".strlen($post_string)."rn"); 
   fputs($fp, "Connection: closernrn"); 
   fputs($fp, $post_string . "rnrn"); 
 
   // loop through the response from the server and append to variable 
   while(!feof($fp)) { 
   $this->ipn_response .= fgets($fp, 1024); 
   } 
 
   fclose($fp); // close connection 
 
   } 
 
   if (eregi("VERIFIED",$this->ipn_response)) { 
 
   // Valid IPN transaction. 
   $this->log_ipn_results(true); 
   return true; 
 
   } else { 
 
   // Invalid IPN transaction.  Check the log for details. 
   $this->last_error = 'IPN Validation Failed.'; 
   $this->log_ipn_results(false); 
   return false; 
 
   } 
 
 } 
 
 function log_ipn_results($success) { 
 
   if (!$this->ipn_log) return;  // is logging turned off? 
 
   // Timestamp 
   $text = '['.date('m/d/Y g:i A').'] - '; 
 
   // Success or failure being logged? 
   if ($success) $text .= "SUCCESS!n"; 
   else $text .= 'FAIL: '.$this->last_error."n"; 
 
   // Log the POST variables 
   $text .= "IPN POST Vars from Paypal:n"; 
   foreach ($this->ipn_data as $key=>$value) { 
   $text .= "$key=$value, "; 
   } 
 
   // Log the response from the paypal server 
   $text .= "nIPN Response from Paypal Server:n ".$this->ipn_response; 
 
   // Write to log 
   $fp=fopen($this->ipn_log_file,'a'); 
   fwrite($fp, $text . "nn"); 
 
   fclose($fp);  // close file 
 } 
 
 function dump_fields() { 
 
   // Used for debugging, this function will output all the field/value pairs 
   // that are currently defined in the instance of the class using the 
   // add_field() function. 
 
   echo "<h3>paypal_class->dump_fields() Output:</h3>"; 
   echo "<table width="95%" border="1" cellpadding="2" cellspacing="0"> 
   <tr> 
   <td bgcolor="black"><b><font color="white">Field Name</font></b></td> 
   <td bgcolor="black"><b><font color="white">Value</font></b></td> 
   </tr>"; 
 
   ksort($this->fields); 
   foreach ($this->fields as $key => $value) { 
   echo "<tr><td>$key</td><td>".urldecode($value)." </td></tr>"; 
   } 
 
   echo "</table><br>"; 
 } 
 } 

 ?>[/CODE]
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Paypal Intergration

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