https://www.colinodell.com/blog/201808/automatically-switch-php-version-cd
Create folder and symlink:
sudo mkdir /usr/alternatives
sudo ln -s /Users/yourname/.php /usr/alternatives/php
Add aliases to .zshrc:
# Switch PHP
alias php56="ln -sf /usr/local/php5/bin/php /Users/yourname/.php && php -v"
alias php72="ln -sf /usr/local/Cellar/php/7.2.8/bin/php /Users/yourname/.php && php -v"
And edit $PATH:
export PATH="/usr/alternatives:$PATH"
Use aliases:
php72
php56