DateTimeZone::listAbbreviations

timezone_abbreviations_list

(PHP 5 >= 5.2.0, PHP 7)

DateTimeZone::listAbbreviations -- timezone_abbreviations_list — Returns associative array containing dst, offset and the timezone name

说明

面向对象风格

public static array DateTimeZone::listAbbreviations ( void )

过程化风格

array timezone_abbreviations_list ( void )

返回值

Returns array on success 或者在失败时返回 FALSE .

范例

Example #1 A timezone_abbreviations_list() example

  <?php
$timezone_abbreviations  =  DateTimeZone :: listAbbreviations ();
 print_r ( $timezone_abbreviations [ "acst" ]);
 ?>

以上例程的输出类似于：

Array
(
    [0] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Porto_Acre
        )    [1] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Eirunepe
        )    [2] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Rio_Branco
        )    [3] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => Brazil/Acre
        ))

参见

timezone_identifiers_list() - 别名 DateTimeZone::listIdentifiers

用户评论:

[#1] jonathan at hogervorst dot info [2014-01-17 23:32:14]

This method returns an associative array containing some 'major' timezones (like CEST), which on their own contain more specific 'geographic' timezones (like Europe/Amsterdam).

If you're using these timezones and their offset/DST information, it's extremely important to realize the following:

*It seems like ALL DIFFERENT OFFSET/DST CONFIGURATIONS (including historical configurations) of each timezone are included!*

For example, Europe/Amsterdam can be found six times in the output of this function. Two occurrences (offset 1172/4772) are for the Amsterdam time used until 1937; two (1200/4800) are for the time that was used between 1937 and 1940; and two (3600/4800) are for the time used since 1940.

*Therefore, YOU CANNOT RELY ON THE OFFSET/DST INFORMATION RETURNED BY THIS FUNCTION as being currently correct/in use!*

If you want to know the current offset/DST of a certain timezone, you'll have to do something like this:

<?php $now = new DateTime(null, new DateTimeZone('Europe/Amsterdam')); echo $now->getOffset(); ?>

P.S. I'm sorry for my use of caps lock in this post, but as this behavior is not described in the documentation, I considered it to be important enough to shout. Normally I don't do such things :)

[#2] kingskippus at gmail dot com [2009-04-04 08:32:38]

Note that the dst field is of boolean type, so if you are doing an identity comparison, you need to test for true or false, not 0 or 1. For example:

<?php $timezone_abbreviations = DateTimeZone::listAbbreviations(); foreach ($timezone_abbreviations["est"] as $tz) { echo $tz['timezone_id']; // if ($tz['dst'] === 1) will always evaluate to false if ($tz['dst'] === true) { echo " (DST observed)<br />\n"; } // Could use else here, but for illustration... if ($tz['dst'] === false) { echo " (DST not observed)<br />\n"; } } ?>