Changes made to Windows support
Deprecated features in PHP 5.3.x
Migrating from PHP 5.2.x to PHP 5.3.x
PHP Manual

## Changes in SAPI modules

- A new SAPI module named litespeed is now available.
- FastCGI support in the CGI SAPI is now always enabled and can not be disabled. See sapi/cgi/CHANGES for more details.
- A new CGI SAPI option, -T, can be used to measure repeated execution time of a script.
- CGI/FastCGI now has support for .htaccess-style user-defined php.ini files.
- The dl() function is now disabled by default, and is now available only under the CLI, CGI, and embed SAPIs.

Changes made to Windows support
Deprecated features in PHP 5.3.x
Migrating from PHP 5.2.x to PHP 5.3.x
PHP Manual