10.3. Obtaining PEAR
In this section, you learn how to install PEAR on your platform from a PHP distribution or through the go-pear.org web site.
10.3.1. Installing with UNIX / Linux PHP Distribution
This section describes PEAR installation and basic usage that is specific for UNIX or UNIX-like platforms, such as Linux and Darwin. The installation of the PEAR Installer itself is somewhat OS-dependent, and because most of what you need to know about installation is OS-specific, you find that here. Using the installer is more similar on different platforms, so that is described in the next section, with the occasional note about OS idiosyncrasies.
As of PHP 4.3.0, PEAR with all its basic prerequisites is installed by default when you install PHP. ...