I've just been setting up PHP 5.2.2 on Windows XP Pro, with Apache 2.0.59. I couldn't get Apache to find the correct php.ini file. It was looking in C:Windows, instead of where I installed PHP. The httpd.conf file told Apache to look in C:Program FilesPHP, but it wasn't. So none of the extensions were loading.

The problem? She wasn't putting in the right kind of slashes into her configuration file. It couldn't find the right path because of it. The issue isn't mentioned in the latest version of the Underground PHP and Oracle Manual (but will be in the future).