PHP 5.x reaches the end of life by the end of 2018
Description
PHP 5.x reaches the end of life by the end of 2018 so we need to upgrade our PHP clients, servers to use PHP 7.x as the default.
Ref: http://php.net/supported-versions.php
openapi-generator version
I suggest we do it as part of the 4.0.0 release (next major release)
Suggest a fix/enhancement
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