Online PHP editor | refs for A4TcN

<?php function timezone_list() { static $timezones = null; if ($timezones === null) { $timezones = array(); $offsets = array(); $now = new DateTime(); foreach (DateTimeZone::listIdentifiers() as $timezone) { $now->setTimezone(new DateTimeZone($timezone)); $offsets[] = $offset = $now->getOffset(); $timezones[$timezone] = '(GMT ' . ($offset ? sprintf('%+03d:%02d', intval($offset / 3600), abs(intval($offset % 3600 / 60))) : '') . ') ' . str_replace(array("/", "_", "St "), array(", ", " ", "St. "), $timezone); } array_multisort($offsets, $timezones); } return $timezones; } print_r(timezone_list());