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How do I compile a PHP extension with Microsoft Visual C++ 2008?

Posted by: admin July 12, 2020 Leave a comment


I created a PHP Hello World extension DLL with Microsoft Visual C++ 2008. I have the right php.ini (I know because when I enable and disable the gd2 extension, there is an effect), but when I load the extension it does not pop up under the Additional Modules in phpinfo().

When I try to test the function (a simple double() function) it obviously does not work. I used this tutorial).

If someone could supply their dll created when doing this (to see If mine’s messed up or if it’s my server) then I’d gladly test it.

System Specs

OS: Windows (Vista)
Server: WAMP
PHP: 5.3.5 (Xampp and IIS also installed)

When I run the command php --ini i get this error:

PHP Startup: TalkPHP Extension: Unable to initalize module
Module compiled with build ID=API20090626, TS, VC9.
PHP   compiled with build IF=API20090626, TS, VC6.
These options need to match

Does this mean I have to use Version 9 to compile PHP?

How to&Answers:

VC9 and VC6 builds are not compatible. You either have to compile your DLL with VC6 or get PHP binaries compiled with VC9 from their download page.

If you are using Apache and mod_php you will also need a VC9 build of Apache to load the VC9 PHP, you can get those from apachehaus.com.


Solution from the comments…

-I found the solution forums.zend.com/viewtopic.php?f=55&t=2045

-Possible duplicate: question: stackoverflow.com/questions/3641751/

I get these warnings

c:\wamp\bin\php\php-5.3.5src\zend\zend_build.h(19) : warning C4005: 'PHP_COMPILER_ID': macro redefinition c:\wamp\bin\php\php-5.3.5src\main\config.w32.h(189) : see previous definition of 'PHP_COMPILER_ID' 1>
c:\wamp\bin\php\php-5.3.5src\main\config.w32.h(189) : warning C4005: 'PHP_COMPILER_ID' : macro redefinition 1> 
c:\wamp\bin\php\php-5.3.5src\zend\zend_build.h(19) : see previous definition of'PHP_COMPILER_ID'

I think it has to do with the fact that mine actually says compiled with VC9 and on the others it has nothing. (They’re warnings but I think it’s why it doesn’t work)

Ok, did nothing more but just tried it but when I ran the extension it WORKED. I still got errors from php –ini but it ran and WORKED.


I compiled and run successfully a custom php extension.

Can you try the following:

  • get the vc9 build from php-5.3.5
  • don’t #define PHP_COMPILER_ID in the zend_build.h header file (IMHO that’s a bad idea anyway)
  • you probably defined PHP_COMPILER_ID in config.w32.h, too; remove it
  • in your project settings (C/C++ – Preprocessor) define: PHP_COMPILER_ID=\”VC9\”
    (if you need the vc6 build of php then I would try to define PHP_COMPILER_ID=\”VC6\”; I don’t know whether this works without problems but I’ve used the constellation [php-5.2.x vc6, custom php extension compiled with vc9] without problems, ever)