Run the following Homebrew commands to install PHP and MySQL
test with /usr/local/Cellar/php56/5.6.0/bin/php --version (test)
edit ~/.config/fish/fish.config or ~/.bash_profile
add the line alias php='/usr/local/Cellar/php56/5.6.0/bin/php'
test with php --version (should yield PHP 5.6.0 (cli))