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PHP List of Known Time Zones

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  1. <?php 
  2.  
  3. function getTimezoneOptions() {
  4. 	$abbr = DateTimeZone::listAbbreviations();
  5. 	$options = array();
  6. 	foreach ($abbr as $section => $zones) {
  7. 		foreach ($zones as $zone) {
  8. 			if (!$zone['timezone_id']) {
  9. 				continue;
  10. 			}
  11. 			if (isset($options[$zone['timezone_id']])) {
  12. 				continue;
  13. 			}
  14. 			if (strpos($zone['timezone_id'], 'GMT') !== false) {
  15. 				// ignore the plain GMT zones
  16. 				continue;
  17. 			}
  18. 			$offset = round($zone['offset'], 2) / 3600;
  19. 			$hours = floor($offset);
  20. 			$minutes = ($offset - $hours) * 60;
  21. 			$minutes = $minutes == 0 ? '00' : $minutes;
  22. 			// ignore the weird ones
  23. 			if (!in_array($minutes, array('00','15','30','45'))) {
  24. 				continue;
  25. 			}
  26. 			$sign = substr($hours,0,1) == '-' ? '-' : '+';
  27. 			$hours = abs($hours);
  28. 			$options[$zone['timezone_id']] = str_replace('_', ' ', $zone['timezone_id']) . " ($sign$hours:$minutes)";
  29. 		}
  30. 	}
  31. 	asort($options);
  32. 	return $options;
  33. }
  34.  
  35. // example output:
  36. Array
  37. (
  38.     [Africa/Abidjan] => Africa/Abidjan (+0:00)
  39.     [Africa/Accra] => Africa/Accra (+0:00)
  40.     [Africa/Addis_Ababa] => Africa/Addis Ababa (+3:00)
  41.     [Africa/Algiers] => Africa/Algiers (+2:00)
  42.     [Africa/Asmara] => Africa/Asmara (+3:00)
  43. 	...
  44. )

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