The latest version of PHP is in market. It has become my favorite web programming language. You can download PHP 5.2 from PHP.net.
The new features in PHP include:
New memory manager for the Zend Engine with improved performance and a more accurate memory usage tracking.
Input filtering extension was added and enabled by default.
JSON extension was added and enabled by default.
ZIP extension for creating and editing zip files was introduced.
Hooks for tracking file upload progress were introduced.
Introduced E_RECOVERABLE_ERROR error mode.
Introduced DateTime and DateTimeZone objects with methods to manipulate date/time information.
Upgraded bundled SQLite, PCRE libraries.
Upgraded OpenSSL, MySQL and PostgreSQL client libraries for Windows installations.
Many performance improvements.
Over 200 bug fixes.