Note:
This extension has been moved to the PECL repository and is no longer bundled with
PHP as of PHP 5.0.0.
Information for installing this PECL extension may be
found in the manual chapter titled Installation
of PECL extensions. Additional information such as new releases,
downloads, source files, maintainer information, and a CHANGELOG, can be
located here:
http://pecl.php.net/package/notes.