To install PEAR
sudo apt-get install php-pear
sudo pear channel-update pear.php.net
sudo pear upgrade-all
To install php doc
sudo pear channel-discover pear.phpdoc.org
sudo pear remote-list -c phpdoc
sudo pear config-set data_dir /var/www
sudo pear install --alldeps PhpDocumentor
sudo pear install phpdoc/phpDocumentor
sudo mkdir /var/www/PhpDocumentor-output
sudo chown www-data /var/www/PhpDocumentor-output
To Install phpmd
sudo pear channel-discover pear.phpmd.org
sudo pear remote-list -c phpmd
sudo pear install phpmd/PHP_PMD
To install codesniffer
sudo pear install PHP_CodeSniffer
To install phpdepend
sudo pear channel-discover pear.pdepend.org
sudo pear remote-list -c pdepend
sudo pear install pdepend/PHP_Depend
To check all pear packages
sudo pear list all
other useful commands
sudo pear upgrade-all
to install phpunit test
sudo apt-get install phpunit