So first I had to install PDepend, PHPMD depends on it.
sudo pear channel-discover pear.pdepend.org sudo pear install pdepend/PHP_Depend pear channel-discover pear.phpmd.org sudo pear install phpmd/PHP_PMD
Help text for PHPMD:
Mandatory arguments: 1) A php source code filename or directory. Can be a comma-separated string 2) A report format 3) A ruleset filename or a comma-separated string of rulesetfilenames Available formats: xml, text, html. Available rulesets: cleancode, codesize, controversial, design, naming, unusedcode. Optional arguments that may be put after the mandatory arguments: --minimumpriority: rule priority threshold; rules with lower priority than this will not be used --reportfile: send report output to a file; default to STDOUT --suffixes: comma-separated string of valid source code filename extensions --exclude: comma-separated string of patterns that are used to ignore directories --strict: also report those nodes with a @SuppressWarnings annotation
mike@mike:~/Sites/wordpress-svn$ time phpmd . text codesize,unusedcode > phpmd.log real 29m3.751s user 28m30.463s sys 0m12.998s
Output is available at http://pastebin.com/BST2evre