Installer does not start.

Environment:
WinXP SP2, Apache 2.0, PHP 4.4 as CGI, MySQL 5.0

Symptom:
I unziped CVS version into a subfolder (Drupal50) in apache document root.

Accessed it via:
http://localhost/Drupal50
redirects me to:
http://localhost/php/installer.php
instead of:
http://localhost/Drupal50/installer.php

Workaround:
One should set the $base_url variable correctly in the sites/default/seffings.php

Correction proposal:

The base url autodetection code is buggy in the includes\bootstrap.inc file.

I recommend to change the line 177 from this:

if ($dir = trim(dirname($_SERVER['PATH_INFO']), '\,/')) { 

to this:

if ($dir = trim(dirname($_SERVER['PHP_SELF']), '\,/')) {