You can install dephpugger in two different ways. In your local project or in global path.

# Global mode
$ composer global require "tacnoman/dephpugger":"dev-master"

# Local mode
$ composer require "tacnoman/dephpugger":"dev-master"

For global mode

When you use composer in global mode, it creates a folder called .composer in your home. Open your ~/.bash_profile and add this lines.

if [ -d "$HOME/.composer/vendor/bin" ] ; then

Now you can run the command dephpugger.

For local mode

php vendor/bin/dephpugger

You will see this: