Bug fixes for general core bugs in 3.6.x will end 11 November 2019 (12 months).
Bug fixes for security issues in 3.6.x will end 11 May 2020 (18 months) - Support has ended.
minimum PHP 7.0.0 Note: minimum PHP version has increased since Moodle 3.3. PHP 7.1.x and 7.2.x are supported too. PHP 7.3.x support is being implemented (@ MDL-63420) and not ready for production with this release.