Knowledge base for Windows Webmasters, Administrators and Web hosting compagnies, with a special attention to WAMP (Windows Apache MySQL PHP). Most articles/tips are currently in use on web hosting servers. This is an open site, please participate or even join us.
New:
eAccelerator 0961 for PHP 5.3.3
eAccelerator 0961 for PHP 5.2.14
eAccelerator 0.9.5.1 for PHP 4.4.9

eAccelerator binaries for PHP 5.x (windows builds)

For the Windows eAccelerator for php 5.3+ visit our new page at:eAccelerator binaries for PHP 5.3+.

Updated: eAccelerator download using latest code (0.9.5.3 with PHP 5.2.9).

Please find following the compiled binaries of eAccelerator for Windows using Microsoft VC++ 6. For PHP 4 versions: eAccelerator binaries for PHP 4.x.
If you need a version not offered here, let us know (post comment).

Alternative PHP Cache ( APC )

This accelerator does not perform well at all under Apache 2.2.0. Just running one of my site used nearly all the memory (30M max).
The segment feature doesn't really work on Windows, so you're limited to 30M.
Update02/2006: Under Apache 2.0.55 and 2.2.2 it seems to perform normally.

eAccelerator seems faster then APC. But if you are running multiple instances of Apache on the same server you will appreciate a second caching tool for PHP. I use both APC and eAccelerator with production sites. APC seems to be getting better just in the last 3 months (since 01/2006).

Note: This accelerator might get better, in the near future, since some of the PHP developers appear to also be involved with APC.

Windows binaries download:
http://pecl4win.php.net/ext.php/php_apc.dll
Sitebuddy APC Windows Binaries for PHP 5.
Sitebuddy APC Windows Binaries for PHP 4.

eAccelerator

We have been using this PHP accelerator (0.9.X), on multiple servers, for a long time. It's used on some high traffic sites without any problem.

Install:
a) Download a copy of eAccelerator that is compatible with your version of PHP.
This can be an issue with eAccelerator. Sometimes it can take a little time before the Windows binaries are available for the most recent version of PHP.

APC binaries for PHP 5.x (windows builds)

Updated: APC download using latest code (3.0.12p2).

Windows 2003 XP search file content does not work...

Solution:
Most administrators have been doing this for years on Windows 2000. The "search content" behavior changed in 2003 (XP is similar). Basically Microsoft added options be enabling specialized filters to perform the search. For example the HTML filter skips the comments.
To add the plain text filter to files with the .php extension add the following to the registry:

Setting up PHP as Fast CGI (FCGI) under Apache

1) Download the Apache mod_fcgi module: http://fastcgi.coremail.cn/

2) Configuration in your Apache httpd.conf:
a) LoadModule fcgid_module modules/mod_fcgid.so

b.1) <Directory "C:/Apache2/htdocs/php/">
    SetHandler fcgid-script
    Options execCGI

Running IIS and Apache on the same server

You can not have two services offered on the same ip and port numbers.
On the same server, different services (IIS and Apache) need a unique IP/Port combination.

1) IIS might be binding to all ips on port 80. This has been the standard behavior of IIS since many years. So to run Apache with IIS, you first need to make sure IIS does not bind (i.e. listen) on all ips. The following article will help you disable IIS 6 from automatically binding to all ips on the Windows 2003 Server.

Before IIS6 (i.e IIS5), you simply had to set the metabase property "DisableSocketPooling" to true (and that was it).
For details on doing this see: Disable socket pooling on IIS5