NOTE: This assumes that you have Valet, Homebrew, Sublime Text and PHP properly installed and functioning and will only focus on the setup and installation and setup of Xdebug. There are other tutorials that go into great depth explaining how to get those tools installed on your mac.
Let's get started right away!
You need to know which version of PHP you are running in your machine. To do so, from the terminal run the command
php -v and this will display something like this
PHP 7.0.14 (cli) (built: Dec 8 2016 23:34:17) ( NTS )