PHP 时区列表不一致

Question

所以我使用 drupal 6 的 date_timezone_names 生成时区列表：

/**
 * A translated array of timezone names.
 * Cache the untranslated array, make the translated array a static variable.
 *
 * @param $required
 *   If not required, returned array will include a blank value.
 * @return
 *   an array of timezone names
 */
function date_timezone_names($required = FALSE, $refresh = FALSE) {
  static $zonenames;
  if (empty($zonenames) || $refresh) {
    $cached = cache_get('date_timezone_identifiers_list');
    $zonenames = !empty($cached) ? $cached->data : array();
    if ($refresh || empty($cached) || empty($zonenames)) {
      $data = timezone_identifiers_list(DateTimeZone::ALL_WITH_BC);
      // Use include instead of include once in case the function gets
      // refreshed via devel or other API and is called more than once.
      if (module_exists('date_php4')) {
        include('./'. drupal_get_path('module', 'date_php4') .'/date_php4_missing_data.inc');
      }
      foreach ($data as $delta => $zone) {
        // Because many time zones exist in PHP only for backward
        // compatibility reasons and should not be used, the list is
        // filtered by a regular expression.
        if (preg_match('!^((Africa|America|Antarctica|Arctic|Asia|Atlantic|Australia|Europe|Indian|Pacific)/|UTC$)!', $zone)) {
          // https://github.com/Br3nda/drupal-module-date/blob/master/date_api.module
          $zonenames[$zone] = $zone;
        }
      }
      // If using PHP4, filter the list down to only the timezones
      // the PHP4 wrapper has data for.
      if (module_exists('date_php4')) {
        foreach ($missing_timezone_data as $zone) {
          unset($zonenames[$zone]);
        }
      }

      // If using Event, further filter the list down to only
      // zones that exist in the event module.
      if (module_exists('event') && db_table_exists('event_timezones')) {
        $result = db_query("SELECT name FROM {event_timezones} ORDER BY name");
        $names = array();
        while ($row = db_fetch_array($result)) {
          $names[] = str_replace(' ', '_', $row['name']);
        }
        foreach ($zonenames as $name => $zone) {
          if (!in_array($name, $names)) {
            unset($zonenames[$name]);
          }
        }
      }
      if (!empty($zonenames)) {
        cache_set('date_timezone_identifiers_list', $zonenames);
      }
    }
    foreach ($zonenames as $zone) {
      $zonenames[$zone] = t($zone);
    }
  }
  $none = array('' => '');
  return !$required ? $none + $zonenames : $zonenames;
}

注意它最终会调用 timezone_identifiers_list(DateTimeZone::ALL_WITH_BC)

但有时 return 的列表不一致...有时 Asia/Chita (GMT+8) 等时区出现在列表中...有时，该时区不存在在列表中....还要注意 Asia/Chita 不在 date_php4_missing_data.inc

中

知道为什么会这样吗？在什么情况下 $data = timezone_identifiers_list(DateTimeZone::ALL_WITH_BC); return 时区列表不一致？

另一个有时出现有时不出现的时区：Asia/Srednekolymsk ...请注意，这也不在 date_php4_missing_data.inc

中

Answer 1

Asia/Chita 和 Asia/Srednekolymsk 都在 2014f 中添加到 tzdb（announcement here). This update corresponds to PHP's timezonedb 版本 2014.6.

您可以看到 timezone_version_get() 安装的 timezonedb 的当前版本，如记录 here。

完全有可能 PHP 安装不同版本的 timezonedb，无论是由于运行 PHP 本身的旧版本，还是手动更新了 timezonedb PECL包裹。如果您关心最新的时区，那么您应该订阅 IANA tz announcements mailing list，并根据需要对 PHP 的 timezonedb 应用相应的更新。

PHP 时区列表不一致

PHP timezone list inconsistent

php

timezone

datetime

drupal

date