Extensions that are gone from the PHP core

One of the first things you're likely to notice when you download PHP 5.1.x is that several of the older extensions have disappeared. Those extensions that are still actively maintained are available in the PHP Extension Community Library (PECL), at » http://pecl.php.net/.

Removed extensions

Extension	Alternative/Status
ext/cpdf	pecl/pdflib
ext/dbx	pecl/dbx
ext/dio	pecl/dio
ext/fam	Not actively maintained
ext/ingres_ii	pecl/ingres
ext/ircg	Not actively maintained
ext/mcve	pecl/mcve
ext/mnogosearch	Not actively maintained
ext/oracle	ext/oci8 or ext/pdo_oci
ext/ovrimos	Not actively maintained
ext/pfpro	Not actively maintained
ext/w32api	» pecl/ffi
ext/yp	Not actively maintained
ext/activescript	» pecl/activescript

Modules in PECL that are not actively maintained (i.e. have not been supported for some time, have no active maintainer working on them currently, and do not have any PECL package releases), are still available in SVN at » http://svn.php.net/viewvc/pecl. However, unreleased PHP modules are by their nature unsupported, and your mileage may vary when attempting to install or use them.

Class constants in new PHP 5.1.x extensions

The Zend Engine 2.1 API allows extension developers to declare class constants in object oriented extensions. New extensions written for PHP 5.1.x, including SPL, PDO, XMLReader and date, have their constants in the format PDO::CLASS_CONSTANT rather than in the C format PDO_CLASS_CONSTANT in order to minimise pollution of the global namespace in PHP.