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).
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.