Checks source trees for fully qualified function calls and constants.

This tool is no longer maintained, but there are several alternatives you can use:

• Check out friendsofphp/php-cs-fixer with its native_function_invocation option.
• Check out the maintained fork at https://github.com/T-Regx/fqn-check if you just want a small tool to check for fully qualified function calls.