Best introduction for PEAR

 PEAR - PHP Extension and Application Repository
 PEAR is a framework and distribution system for reusable PHP components.

Install all PEAR packages

In this case, you are in full control of the entire PEAR packages installation, including PEAR Base System and any additional packages you need.

• Step #1: Install PEAR Base System
• Step #2: Create PEAR include path.
• Step #3: Test if PEAR has been installed correctly.

Read all at  http://www.geeksengine.com/article/install-pear-on-shared-web-host.html