I need both PHP 5.4.7 and 5.3.17 running on Windows 7 x64 with Apache 2.2.23. This is my virtual host configuration:

<VirtualHost *:80>
    DocumentRoot  "C:/WAMP/Apache/htdocs/php54"
    ServerName php54.local
    PHPIniDir "C:/WAMP/PHP54"
    LoadModule php5_module "C:/WAMP/PHP54/php5apache2_2.dll"
    php_value extension_dir "C:/WAMP/PHP54/ext"

    <Directory "C:/WAMP/Apache/htdocs/php54">
        Order allow,deny
        Allow from all
    </Directory>
</VirtualHost>

The PHPIniDir and LoadModule directives work fine and using phpinfo() inside my script prints the right PHP version.

But I need to load extensions, and this is where it fails. php_value extension_dir should be C:/WAMP/PHP54/ext but it's (default one) C:/php.

What I'm missing here?

EDIT: Of course I can set this value directly in C:/WAMP/PHP54/php.ini, but I prefer passing it using vhost configuration:

; Directory in which the loadable extensions (modules) reside.
; http://php.net/extension-dir
; extension_dir = "./"
; On windows:
extension_dir = "C:/WAMP/PHP54/ext"