Where do PEAR packages normally get installed?
Yes, that is the correct directory on Debian, and Ubuntu.
Regardless of which O/S you are using, you can find the correct install directory by running: pear config-get php_dir
via a console. And you get full directory path.
For example, with XAMPP application on Microsoft Window you have to go to XAMPP installation directory path <<XAMPP Installation folder path>>/bin
and use ./pear config-get php_dir
which lead to execute the binary file using current location and do the same job.