First install the module php-xsl
pacman -S php-xsl
Enable xsl.so extension with vim /etc/php/php.ini and restart apache
extension=xsl.so
Move to the folder where you want to keep phpdoc files, download extract and rename. Check https://github.com/phpDocumentor/phpDocumentor2/releases for the latest release.
cd ~/.build-repos && wget https://github.com/phpDocumentor/phpDocumentor2/releases/download/v2.9.0/phpDocumentor-2.9.0.tgz && tar xvfz phpDocumentor-2.9.0.tgz && mv phpDocumentor-2.9.0 phpdoc
Now just link the executable to a folder in your path
ln -s /home/dth/.build-repos/phpdoc/bin/phpdoc /home/dth/.bin/phpdoc
After that, from whenever you are, you should be able to call phpdoc. To test:
phpdoc run -h
To generate documentation (default template: clean)
phpdoc run -d -t [target folder] --template responsive