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Paypal IPN Script release with feof and fgets

I have been having problems with my IPL Paypal script listener for a couple of days. For those of you who are not familiar with Paypal's IPN system, basically Paypal sends your script a message about the transaction you send back with a few bits added. If Paypal gets a correct answer, it will reply "VERIFIED", and if not, it will say "INVALID".

I originally thought the problem I was facing was with the fsockopen command: $ fp = fsockopen ('ssl: //sandbox.paypal.com', 443, $ errno, $ errstr, 30); However, having reduced all of my code to a large chunk of this exact line, it seems to be connected fine. The problem is with the "feof" and "fgets" commands. The script just hangs and I don't know why. I essentially copied the code suggested on the Paynal IPN Listener website, so I assumed it would work! If you could help me understand why feof or fgets are causing it to stall, then your help would be much appreciated.

Here's the complete script:

$postback = 'cmd=_notify-validate'; //doesn't matter what these include for now
$header='abc';

//Script has been activated, create debug
$filename = 'debug/debug1_script.txt';
$filehandle=fopen($filename, 'w');
fwrite($filehandle,$postback);
fclose($filehandle);


$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);//open the connection

//no connection, create debug file
if(!$fp){
    $filename = 'debug/debug2_fpfail.txt';
    $filehandle=fopen($filename, 'w');
    fwrite($filehandle, $errstr.'('.$errno.')');
    fclose($filehandle);
    die();
}


//post data back
fputs($fp, $header . $postback);

//create debug file
$filename = 'debug/debug3_postback.txt';
$filehandle=fopen($filename, 'w');
fwrite($filehandle, $header.$postback);
fclose($filehandle);


//script hangs with either of the two following lines included
while(!feof($fp)){
    $res=fgets($fp,1024);
}

Thank you very much in advance!

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4 answers


So, I think I found a solution that instead of using

while(!feof())

and

fgets()


combo, i used this:

$res=stream_get_contents($fp, 1024);

Worked for the first time! Now I can get on with my life.

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For those coming here Google, don't forget to include "Connection: Close" in your headers! Otherwise, the host will keep the connection open until it ends!



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If anyone else has the same problem, CURL seems to be the recommended choice for IPN via PayPal.

Check out the sample code on Github at: https://github.com/paypal/ipn-code-samples/blob/master/paypal_ipn.php

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The connection to paypal from your socket $fp

must be http POST. feof()

hangs because paypal never hears the full HTTP request, so it never sends anything - it just keeps listening until you give up.

You need some extra stuff (variables $header

and ready-made $req

) in the sample code on this PayPal IPN page .

I would rewrite this to use CURL, if possible, instead of raw sockets, so that you don't have to format the full HTTP request and read the raw HTTP response.

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