Eliminate the need of installing PHP locally, and "re-route" all PHP commands to a PHP enabeld container. Control the version at which PHP is executed through environment variables. Defaults to 7.0

php

#!/bin/bash
#
# Run all PHP commands through a docker container
#
VER=${PHPVERSION:-7.0-cli}
ARGS="-a"
if [ $# -gt 0 ]; then
    ARGS="$@"
fi
docker run -it --rm -v $(pwd):/code -w /code php:$VER php $ARGS

php-docker

 ~  php -v
PHP 7.0.14 (cli) (built: Dec  9 2016 18:05:09) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies

 ~  export PHPVERSION=5.6-cli; php -v
PHP 5.6.29 (cli) (built: Dec 14 2016 15:51:03) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

 ~  export PHPVERSION=7.1-cli; php -v
PHP 7.1.0 (cli) (built: Dec 14 2016 14:48:33) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies

 ~  export PHPVERSION=; php -v
PHP 7.0.14 (cli) (built: Dec  9 2016 18:05:09) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies