We need to have our PHP application hosted on a 64 bit Windows OS due to another application’s requirement. However, reading a bit more on the topic revealed that the PHP implementation is only for a 32 bit environment on Windows.
From: http://en.wikipedia.org/wiki/PHP
PHP interpreters are available on both
32-bit and 64-bit operating systems,
but on Microsoft Windows the only
official distribution is a 32-bit
implementation, requiring Windows
32-bit compatibility mode while using
Internet Information Services (IIS) on
a 64-bit Windows platform. As of PHP
5.3.0, experimental 64-bit versions are available for MS Windows.[22]
Would running IIS on 32 bit mode cause potential problems with PHP?
What are the experiences people have had with such a setup?
Possible Issues:
http://www.iisadmin.co.uk/?p=14
http://www.iis-aid.com/articles/how_to_guides/php_64_bit_windows
Installation:
http://www.elxis.org/guides/developers-guides/64bit-apache-php-mysql-windows.html