Paypal error after change from PHP FastCGI to PHP ISAPI

Hi all,

Need some help here. I am running on PHP 4.3.4 Fast CGI for my e-commerce platform which uses Paypal as a gateway.

However, due to the instability of FastCGI, I have switched to ISAPI and all functions can work except Paypal.

Can I ask whether there is a difference if I use FastCGI or ISAPI for Paypal?

I attached the code we used which is successful when using under FASTCGI but fails under ISAPI.
expresscheckout.php
cq27Asked:
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cq27Connect With a Mentor Author Commented:
Hi all,

While waiting for the answer, I have checked on online forums and discovered the error was just a simple solution.

I needed to activate the CURL setting in ISAPI. After a test, it works fine now. There is no need to upgrade to PHP5.3.8 as Paypal originally worked fine in PHP434, just that I switched between FastCGI and ISAPI.
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Ray PaseurCommented:
PHP 4.3.4

You have to fix that.  There is no support at all for PHP4 any more.  In fact, the PHP.net web site says this: All PHP users should note that the PHP 5.2 series is NOT supported anymore. All users are strongly encouraged to upgrade to PHP 5.3.8.

The upgrade is not optional; it is required and unfortunately it may be a big project.  In addition to the script attached to this question you will almost certainly need to refactor the code in this thing.
require_once ("paypalfunctions.php");

There are some resources that can help.  
https://www.x.com/developers
http://us2.php.net/manual/en/migration53.changes.php
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cq27Author Commented:
I discovered the solution on my own via online forums.
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Ray PaseurCommented:
There is no need to upgrade to PHP5.3.8

Uhh?

No offense meant... you can do whatever you want; it's not my problem.  But I would fire a programmer who saw the PHP.net home page and then told me something like that.  The lack of understanding about the PHP4 security implication alone is sufficient to terminate for cause.
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