- Upgrade Notes
- Release Notes (Windows)
Here's some overview on what will the next PHP 5.x contains:
- Namespaces (documentation maybe out dated)
- Late static binding and __callStatic
- Lambda functions and closures
- Addition of the intl, phar (phar is scheduled for some more work a head of alpha2), fileinfo and sqlite3 extensions
- Optional cyclic garbage collection
- Optional support for the MySQLnd replacement driver for libmysql
- Windows older than Windows 2000 (Windows 98, NT4, etc.) are not supported anymore (details)
- New syntax features like NOWDOC, limited GOTO, ternary short cut "?:"
Make sure you download the updated documentation (the latest one at the time i write this post is dated 1 August 2008). More updates will became available when the final version is getting near the release date.