I found this post (https://community.c9.io/t/how-to-upgrade-to-php7/1379) and tried to use it to upgrade my workstations. But I keep getting an 'Invalid Argument' when I attempt 'phpbrew use php-7.0.10' or 'phpbrew switch php-7.0.10'.
Maybe it's because you typed phpbrew use php-7.0.10 instead of phpbrew use php-7.0.1?
phpbrew use php-7.0.10
phpbrew use php-7.0.1
You never know, the command line can be an ass like that.