GD2 Problems? This may help...

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Using Apache 2.2.4 and PHP 5.2.1 on Windows, I was getting the "Call
to undefined function imagecreate()" error. I solved the problem, but
the solution for my situation was not documented anywhere on the web,
so I am posting it here.

The root of the problem is that the GD2 library is not installed. The
first thing to do is make sure the GD2 library. Your php.ini file
should have these lines

extension_dir = "C:\PHP\ext"
extension=php_gd2.dll

It seems like this solves 99% of the cases...but not mine! The real
problem was that PHP improprely edited Apache's httpd.conf file during
installation. MAKE SURE the httpd.conf file has a clean reference to
PHP that looks something like:

# For PHP 5:
LoadModule php5_module "c:/php/php5apache2.dll"
AddType application/x-httpd-php .php

# configure the path to php.ini
PHPIniDir "C:/php/"

In my case, all that text was on a single line with some odd
characters (improper newlines?) in there. I think this was caused by
a problem in the installed. Once I cleaned it up to look like the
lines above, it worked.

Anyway, hopefully this will save people some time.