I've a new server with PHP v7.1.0RC3 installed. According to DevDocs Magento 2 is compatible with 7.0.2 up to 7.1.0, except for 7.0.5 which makes PHP 7.1.0 compatible with M2 however when tried to install repo I get following error:
Problem 1
– Installation request for magento/product-community-edition 2.1.1 -> satisfiable by magento/product-community-edition[2.1.1].
– magento/product-community-edition 2.1.1 requires php ~5.6.0|7.0.2|~7.0.6 -> your PHP version (7.1.0RC3) does not satisfy
that requirement.
Best Answer
Update - September 2017:
Magento 2.2 now officially supports PHP 7.1, so that's the Magento version you should aim for from now on if PHP 7.1 is something you want or need on your platform.
Original - October 2016:
I am actually wondering if the DevDocs documentation is a mistake and maybe they meant PHP 7.0.10 instead of 7.1.0, that would make more sense to me.
That being said, I guess Magento 2.1.1 could be compatible with PHP 7.1, if you want to test it, just add this additional parameter to your composer commands to tell Composer to ignore the PHP version check for the time being:
composer install --ignore-platform-reqsUpdate:
After raising an issue on Github, the requirements description now has been updated to reflect that PHP 7.1 is not supported at this point. The description was indeed a typo.