Add support for php7

[agiuliano]

Php 7 is going to be released, why not to add a branch with php7 under the hood?

[RobLoach]

https://hub.docker.com/r/library/php/

Looks like targeting 7-cli will bring in PHP 7.0.0-RC8 currently. Sounds like a great plan.

[agiuliano]

@RobLoach is it normal that if I enter in the downloaded composer/composer:php7 and I type php --version it says PHP 5.6.15 (cli)?

[RobLoach]

@agiuliano It's because php7 uses composer/composer:base, which is currently tagged as using PHP 5.6 😉 . We'll need a composer/composer:php7-base, or something.

[agiuliano]

but in composer/composer:base I see that php-7 is required in the php7 branch (https://github.com/RobLoach/docker-composer/blob/php7/base/Dockerfile)

[RobLoach]

True, but composer/composer:base is tagged on Docker Hub with php 5.6. We'll need to modify the branch to use a different base.

Like this: 43fa55f

[agiuliano]

you're right, do you already tagged the php7-base on dockerhub to the php7 branch?

[RobLoach]

composer/composer:php7 should be up by now.

[RobLoach]

Now that PHP 7.0.5 is out, and considered stable. I'm proposing we switch composer/composer:base to target php:cli.