# timezone_name_from_abbr

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

timezone_name_from_abbr — Returns a timezone name by guessing from abbreviation and UTC offset

### 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`.

### 示例

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";`

以上示例的输出类似于：

    Europe/Berlin
    Europe/Paris

### 参见

- timezone_abbreviations_list() - 别名 DateTimeZone::listAbbreviations

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