Since 2016-10-25, the latest Magento 2.2 requires at least PHP 5.6.5

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From 2016-10-25, the latest Magento 2.2 requires at least PHP 5.6.5:

https://github.com/magento/magento2/blob/9666070/composer.json#L11-L11

https://github.com/magento/magento2/commit/9666070