The new releases include several security fixes relating to the exif and fbsql extensions, as well as the unserialize(), swf_definepoly() and getimagesize() functions. There are also over 70 non-critical bug fixes. The PHP Dev Team says that all PHP users are “strongly encouraged to upgrade”.
PHP download page.
PHP 4.3.11 ChangeLog.
PHP 5.0.4 ChangeLog.
Lucas has been building the web since 1996. His experience covers Content Management, Online Learning, Documentation Management, Product Ordering and ecommerce systems across Linux(Debian/Redhat/CentOS), Mac OS, FreeBSD and Microsoft platforms.