PHPWales 2020 - June 3rd to June 4th

DateTimeZone::listAbbreviations

timezone_abbreviations_list

(PHP 5 >= 5.2.0, PHP 7)

DateTimeZone::listAbbreviations -- timezone_abbreviations_listВозвращает ассоциативный массив, содержащий флаг перехода на летнее время, смещение и имя временной зоны

Описание

Объектно-ориентированный стиль

public static DateTimeZone::listAbbreviations ( void ) : array

Процедурный стиль

timezone_abbreviations_list ( void ) : array

Замечание:

Данные для функции предварительно компилируются из соображений производительности и не обновляются при использовании более новой версии » timezonedb.

Возвращаемые значения

В случае успешного выполнения возвращает массив или FALSE в случае возникновения ошибки.

Примеры

Пример #1 Пример использования timezone_abbreviations_list()

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

Результатом выполнения данного примера будет что-то подобное:

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
        )

)

Смотрите также

add a note add a note

User Contributed Notes 2 notes

up
63
jonathan at hogervorst dot info
5 years ago
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 :)
up
-8
kingskippus at gmail dot com
10 years ago
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";
    }
  }
?>
To Top