That's only useful if you've already installed PEAR yourself, into your own home directory, and even then if you want to install the entire PEAR library, which almost no one would, I'd imagine.
Anyway, I did this myself because the DH selection of modules is a bit skimpy, to put it mildly (no XML packages??). There are good instructions in the PEAR manual. You'll have to install an SSH client and set up shell access for yourself before you can get to this part, of course. Once you've got it installed, you can run all your pear commands as you normally would, but the modules will be installed into the location you specified when you installed PEAR.
If you want useful replies, ask smart questions.