Dynamically Typed has a new posting today that's perfect for anyone out there curious what improvements/additions really came along with PHP 5.1.

PHP.net announced over the weekend that the first public beta of PHP 5.1 (5.1.0) is now available for download on PHP.net. So what's changed?

• The PCRE library (providing Perl-style regular expression support) has been updated to version 5.0.
• Several performance improvements, including changes to garbage collection, the switch statement, and several array functions.
• Several improvements in the PostgreSQL and Improved MySQL support.
• Several new functions including array_diff_key, array_diff_ukey, array_intersect_key and array_intersect_ukey.

There's still (as of this writing) not an announcement on the PHP.net site, but you can still get the latest through snaps...