php_installer is an NSIS installer I whipped up to download and install PHP 5.2.6, PECL, the PHP CHM manual, and the Zend Optimizer found at http://www.php.net.

You can download the binary here and the binary with the source code here.

Here's the changelog.txt:

php_installer changelog

Version 1.12 - 06 Jun 08:

	Updated PHP to 5.2.6

Version 1.11 - 08 Sep 07:

	Updated PHP to 5.2.5

Version 1.10 - 08 Sep 07:

	Updated PHP to 5.2.4
	Updated Zend Optimizer to 3.3.0a

Version 1.9 - 19 Jun 07:

	Updated PHP to 5.2.3

Version 1.8 - 21 May 07:

	Updated PHP to 5.2.2
	Updated Zend Optimizer to 3.2.8

Version 1.7 - 10 Apr 07:

	Fixed user defined start menu folder bug
	Upgraded NSIS to 2.24 (2.25 appears buggy)

Version 1.6 - 27 Feb 07:

	Updated PHP to 5.2.1
	Updated Zend Optimizer to 3.2.2

Version 1.5 - 28 Nov 06:

	Added Zend Optimizer 3.2.0
	Changed ordering of installation types

Version 1.4 - 06 Nov 06:

	Bumped PHP to version 5.2.0

Version 1.3 - 26 Aug 06:

	Bumped PHP to version 5.1.6

Version 1.2 - 21 Aug 06:

	Bumped PHP to version 5.1.5
	Fixed bugs in php.ini creator script
	Skips php.ini creation if file already exists
	Updated documentation
	Upgraded NSIS to 2.19

Version 1.1 - 20 May 06:

	Added all extensions in /ext to php.ini
	Added error_log setting

Version 1.0 - 16 May 06:

	Initial release

and here's the readme.txt:

php_installer readme.txt
Copyright (c) 2005-2007 Ross Smith II (http://smithii.com) All Rights Reserved

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php_installer lets you download and install PHP 5, the PECL extensions,
the PHP Manual (English) in Windows Help (CHM) Format, and the Zend Optimizer,
which are available at http://www.php.net, and http://zend.com.

php_installer also performs the following:

* copies php.ini-recommended to php.ini and sets the following settings:

  extension_dir="C:\Program Files\php\ext"
  error_log="C:\Program Files\php\logs\phperror.log"
  upload_tmp_dir="C:\Program Files\php\uploads"
  session.save_path="C:\Program Files\php\sessions"

* Adds the following variables to your environment:

   PHPRC=C:\Program Files\php

* Adds the installation directory (typically 
  %ProgramFiles%\php) to your PATH environment variable.

php_installer looks in the directory where php_installer.exe is for 
any files it needs before attempting to download them. If it does download a 
file, it will attempt to save a copy of the file in this same directory.

Note: you are responsible to verify that each program you install using 
php_installer is designed to work in your environment. 
If you are unsure, then please visit http://www.php.net for more information.

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Usage: php_installer [options]

Options:
/S         Install the application silently with the default options selected
/D=path    Install into the directory 'path' (default is 
           %ProgramFiles%\PHP)
/INSTYPE n Where n is a number between 0 and 3:
           0: PHP, PECL, and Manual (Default)
           1: PHP Only
           2: PECL Extensions Only
           3: PHP Manual Only (CHM English)
           4: Zend Optimizer Only
           5: All
           6: None

The following options are planned to be implemented in a future version:

/SAVEDIR d Save downloaded files in directory d
/PROXY     Set proxy settings 
/RETRIES n Number of times to retry each download before reporing failure
           (default: 5) 
/ALLUSERS  Install icons for all users 
           This is the default if the user is an administrator
/USER      Install icons for the current user only 
           This is the default if the user is not an administrator
/VERSION   Show the version and quit 
/?         Show this help message and quit