macOs.install-multi-php.sh

# try to figure out simple multi php install

# https://www.npmjs.com/package/switch-php (yarn or npm - your choice)
yarn global add switch-php 
# npm install --global switch-php

for version in 7.0 7.1 7.2 
do

  brew reinstall php@$version
  switch-php -v $version
  pecl install redis imagick apcu xdebug memcached

  # check versions
  php -v; 
  fpm-php -v

  # check ext
  php -m | egrep 'redis|imagick|apcu|xdebug|memcached'
  pecl list -a | egrep 'redis|imagick|apcu|xdebug|memcached'

done

I had issues with composer global, specifically phing/phing so opted for https://github.com/consolidation/cgr

composer global remove phing/phing
composer global update
composer global require consolidation/cgr

# setup following cgr readme
cgr phing/phing

Thats solved it for me.