PEAR is a framework and distribution system for reusable PHP components.

PEAR is short for "PHP Extension and Application Repository" and is
pronounced just like the fruit. The purpose of PEAR is to provide:
 - A structured library of open-sourced code for PHP users
 - A system for code distribution and package maintenance
 - A standard style for code written in PHP
 - The PHP Extension Community Library (PECL)

WWW: http://pear.php.net/