If you get the following error when trying to install PHP Dead Code Detector (phpdcd):
$ pear install --alldeps pear.phpunit.de/phpdcd Failed to download phpunit/phpdcd within preferred state "stable", latest release is version 0.9.3, stability "beta", use "channel://pear.phpunit.de/phpdcd-0.9.3" to install install failed
You have to force install it:
$ pear install -f pear.phpunit.de/phpdcd
According to Mr. Bergmann in a GitHub issue comment “There is no stable release of PHPDCD." So, force installing is required.