Daniele Orlando - 2016-01-02 10:09:09 - In reply to message 1 from Frederic Yeung
The minimum version is PHP 5.6, as documented in the GitHub project page.
The concise array syntax (  ), variadic arguments operator ( ... ) and other features used are bonded to PHP 5.6.
PHP 5.6 is the only release of the PHP5 series that is supported and there will be no port for earlier releases.
Thank you for the feedback!