timezone_name_from_abbr

(PHP 5 >= 5.1.3, PHP 7, PHP 8)

timezone_name_from_abbr — Returns the timezone name from abbreviation

说明

timezone_name_from_abbr(string $abbr, int $utcOffset = -1, int $isDST = -1): string|false

参数

abbr: Time zone abbreviation.
utcOffset: Offset from GMT in seconds. Defaults to -1 which means that first found time zone corresponding to abbr is returned. Otherwise exact offset is searched and only if not found then the first time zone with any offset is returned.
isDST: Daylight saving time indicator. Defaults to -1, which means that whether the time zone has daylight saving or not is not taken into consideration when searching. If this is set to 1, then the utcOffset is assumed to be an offset with daylight saving in effect; if 0, then utcOffset is assumed to be an offset without daylight saving in effect. If abbr doesn't exist then the time zone is searched solely by the utcOffset and isDST.

返回值

Returns time zone name on success 或者在失败时返回 false.

范例

示例 #1 A timezone_name_from_abbr() example


<?php
echo timezone_name_from_abbr("CET") . "\n";
echo timezone_name_from_abbr("", 3600, 0) . "\n";
?>

以上例程的输出类似于：

Europe/Berlin
Europe/Paris

参见

timezone_abbreviations_list() - 别名 DateTimeZone::listAbbreviations

add a note

User Contributed Notes 4 notes

down

chris at mretc dot net ¶

13 years ago


timezone_name_from_abbr() sometimes returns FALSE instead of an actual timezone: http://bugs.php.net/44780

It's possible to workaround it for some cases by getting the timezone name from timezone_abbreviations_list(). For example, if you have the GMT offset and want a timezone name:

<?php
/* Takes a GMT offset (in hours) and returns a timezone name */
function tz_offset_to_name($offset)
{
        $offset *= 3600; // convert hour offset to seconds
        $abbrarray = timezone_abbreviations_list();
        foreach ($abbrarray as $abbr)
        {
                foreach ($abbr as $city)
                {
                        if ($city['offset'] == $offset)
                        {
                                return $city['timezone_id'];
                        }
                }
        }

        return FALSE;
}
?>

down

Jon Stovell ¶

5 years ago


In some cases, timezone_name_from_abbr() may return a "historical" (i.e. deprecated) timezone identifier rather than the current standard one for a given location. For example:
<?php
echo timezone_name_from_abbr('EASST'); // prints "Chile/EasterIsland" instead of "Pacific/Easter"
?>

This means that the returned timezone identifier is not guaranteed to be in the results of timezone_identifiers_list() unless you include the "backwards compatible" timezones.
<?php
var_dump(in_array(timezone_name_from_abbr('EASST'), timezone_identifiers_list())); // (bool)false
var_dump(in_array(timezone_name_from_abbr('EASST'), timezone_identifiers_list(DateTimeZone::ALL_WITH_BC))); // (bool)true
?>

down

Master Tablu ¶

13 years ago


Another way to do this is to wrap the function in a class that extends the DateTimeZone class:

<?php

/**
 * Helps with timezones.
 * @link http://us.php.net/manual/en/class.datetimezone.php
 *
 * @package  Date
 */
class Helper_DateTimeZone extends DateTimeZone
{
    /**
     * Converts a timezone hourly offset to its timezone's name.
     * @example $offset = -5, $isDst = 0 <=> return value = 'America/New_York'
     * 
     * @param float $offset The timezone's offset in hours.
     *                      Lowest value: -12 (Pacific/Kwajalein)
     *                      Highest value: 14 (Pacific/Kiritimati)
     * @param bool  $isDst  Is the offset for the timezone when it's in daylight
     *                      savings time?
     * 
     * @return string The name of the timezone: 'Asia/Tokyo', 'Europe/Paris', ...
     */
    final public static function tzOffsetToName($offset, $isDst = null)
    {
        if ($isDst === null)
        {
            $isDst = date('I');
        }

        $offset *= 3600;
        $zone    = timezone_name_from_abbr('', $offset, $isDst);

        if ($zone === false)
        {
            foreach (timezone_abbreviations_list() as $abbr)
            {
                foreach ($abbr as $city)
                {
                    if ((bool)$city['dst'] === (bool)$isDst &&
                        strlen($city['timezone_id']) > 0    &&
                        $city['offset'] == $offset)
                    {
                        $zone = $city['timezone_id'];
                        break;
                    }
                }

                if ($zone !== false)
                {
                    break;
                }
            }
        }
    
        return $zone;
    }
}
?>

Then you could do something like this:

<?php
$Dtz = new Helper_DateTimeZone(Helper_DateTimeZone::tzOffsetToName(-5));
var_dump($Dtz->getName());

string(16) "America/New_York"
?>

down

-1

atrauzzi at gmail dot com ¶

6 years ago


Fun fact: (60*60) * -2 always seems to return null.

Perhaps because there's no timezone that corresponds to UTC -2.

add a note

官方地址：https://www.php.net/manual/en/function.timezone-name-from-abbr.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗常用的php ADODB使用方法集锦 [原创]诡异的php-fpm超时问题

略微加速

PHP官方手册 - 互联网笔记

timezone_name_from_abbr

说明

参数

返回值

范例

参见

User Contributed Notes 4 notes