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 :)
DateTimeZone::listAbbreviations
timezone_abbreviations_list
(PHP 5 >= 5.2.0, PHP 7, PHP 8)
DateTimeZone::listAbbreviations -- timezone_abbreviations_list — Retourne un tableau associatif, décrivant un fuseau horaire
Description
Style orienté objet
Style procédural
La liste des abréviations retournée contient tous les usages historiques
des abréviations, ce qui peut amener à des entrées correctes, mais
confus. Il y a aussi des conflits, car PST est utilisé tous deux dans
les États-Unis et les Philippines.
La liste que cette fonction retourne n'est par conséquent pas adapter pour construire un tableau d'option présentant un choix de fuseau horaire aux utilisateurs.
Note:
Les données pour cette fonction sont pré-compilées pour des raisons de performance, et ne sont pas mis à jour lors de l'utilisation d'une » timezonedb plus récente.
Liste de paramètres
Cette fonction ne contient aucun paramètre.
Valeurs de retour
Retourne le tableau des abréviations des fuseaux horaires.
Exemples
Exemple #1 Exemple avec timezone_abbreviations_list()
<?php
$timezone_abbreviations = DateTimeZone::listAbbreviations();
print_r($timezone_abbreviations["acst"]);
?>Résultat de l'exemple ci-dessus est similaire à :
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
)
)
add a note
User Contributed Notes 2 notes
jonathan at hogervorst dot info ¶
10 years ago
kingskippus at gmail dot com ¶
15 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";
}
}
?>
