DateTimeZone::listIdentifiers

timezone_identifiers_list

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

DateTimeZone::listIdentifiers -- timezone_identifiers_list — Returns a numerically indexed array containing all defined timezone identifiers

Descrizione

Stile orientato agli oggetti

public static DateTimeZone::listIdentifiers(int $timezoneGroup = DateTimeZone::ALL, ?string $countryCode = null): array

Stile procedurale

timezone_identifiers_list(int $timezoneGroup = DateTimeZone::ALL, ?string $countryCode = null): array

Elenco dei parametri

timezoneGroup: One of the DateTimeZone class constants (or a combination).
countryCode: A two-letter (uppercase) ISO 3166-1 compatible country code.

Nota: This option is only used when timezoneGroup is set to DateTimeZone::PER_COUNTRY.

Valori restituiti

Returns the array of timezone identifiers. Only non-outdated items are returned. To get all, including outdated timezone identifiers, use the DateTimeZone::ALL_WITH_BC as value for timezoneGroup.

Log delle modifiche

Versione	Descrizione
8.0.0	Prior to this version, `false` was returned on failure.
7.1.0	`countryCode` is nullable now.

Esempi

Example #1 A DateTimeZone::listIdentifiers() example

<?php
$timezone_identifiers = DateTimeZone::listIdentifiers();
for ($i=0; $i < 5; $i++) {
    echo "$timezone_identifiers[$i]\n";
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara

Example #2 Listing identifiers for a specific region

<?php
$timezone_identifiers = DateTimeZone::listIdentifiers( DateTimeZone::ASIA );
for ($i=0; $i < 5; $i++) {
    echo "$timezone_identifiers[$i]\n";
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

Asia/Aden
Asia/Almaty
Asia/Amman
Asia/Anadyr
Asia/Aqtau

Example #3 Listing identifiers for multiple regions

<?php
$timezone_identifiers = DateTimeZone::listIdentifiers( DateTimeZone::ASIA | DateTimeZone::PACIFIC );
echo join( ', ', $timezone_identifiers );
?>

Il precedente esempio visualizzerà qualcosa simile a:

Asia/Aden, Asia/Almaty, Asia/Amman, Asia/Anadyr, Asia/Aqtau, Asia/Aqtobe,
Asia/Ashgabat, Asia/Atyrau, Asia/Baghdad, Asia/Bahrain, Asia/Baku,
Asia/Bangkok, Asia/Barnaul, Asia/Beirut, Asia/Bishkek, Asia/Brunei,
Asia/Chita, Asia/Choibalsan, Asia/Colombo, Asia/Damascus, Asia/Dhaka,
Asia/Dili, Asia/Dubai, Asia/Dushanbe, Asia/Famagusta, Asia/Gaza, Asia/Hebron,
Asia/Ho_Chi_Minh, Asia/Hong_Kong, Asia/Hovd, Asia/Irkutsk, Asia/Jakarta,
Asia/Jayapura, Asia/Jerusalem, Asia/Kabul, Asia/Kamchatka, Asia/Karachi,
Asia/Kathmandu, Asia/Khandyga, Asia/Kolkata, Asia/Krasnoyarsk,
Asia/Kuala_Lumpur, Asia/Kuching, Asia/Kuwait, Asia/Macau, Asia/Magadan,
Asia/Makassar, Asia/Manila, Asia/Muscat, Asia/Nicosia, Asia/Novokuznetsk,
Asia/Novosibirsk, Asia/Omsk, Asia/Oral, Asia/Phnom_Penh, Asia/Pontianak,
Asia/Pyongyang, Asia/Qatar, Asia/Qostanay, Asia/Qyzylorda, Asia/Riyadh,
Asia/Sakhalin, Asia/Samarkand, Asia/Seoul, Asia/Shanghai, Asia/Singapore,
Asia/Srednekolymsk, Asia/Taipei, Asia/Tashkent, Asia/Tbilisi, Asia/Tehran,
Asia/Thimphu, Asia/Tokyo, Asia/Tomsk, Asia/Ulaanbaatar, Asia/Urumqi,
Asia/Ust-Nera, Asia/Vientiane, Asia/Vladivostok, Asia/Yakutsk, Asia/Yangon,
Asia/Yekaterinburg, Asia/Yerevan, Pacific/Apia, Pacific/Auckland,
Pacific/Bougainville, Pacific/Chatham, Pacific/Chuuk, Pacific/Easter,
Pacific/Efate, Pacific/Fakaofo, Pacific/Fiji, Pacific/Funafuti,
Pacific/Galapagos, Pacific/Gambier, Pacific/Guadalcanal, Pacific/Guam,
Pacific/Honolulu, Pacific/Kanton, Pacific/Kiritimati, Pacific/Kosrae,
Pacific/Kwajalein, Pacific/Majuro, Pacific/Marquesas, Pacific/Midway,
Pacific/Nauru, Pacific/Niue, Pacific/Norfolk, Pacific/Noumea,
Pacific/Pago_Pago, Pacific/Palau, Pacific/Pitcairn, Pacific/Pohnpei,
Pacific/Port_Moresby, Pacific/Rarotonga, Pacific/Saipan, Pacific/Tahiti,
Pacific/Tarawa, Pacific/Tongatapu, Pacific/Wake, Pacific/Wallis

Example #4 Listing identifiers for a single country

<?php
$timezone_identifiers = DateTimeZone::listIdentifiers( DateTimeZone::PER_COUNTRY, "UA" );
foreach( $timezone_identifiers as $identifier ) {
    echo "$identifier\n";
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

Europe/Kyiv
Europe/Simferopol
Europe/Uzhgorod
Europe/Zaporozhye

Vedere anche:

timezone_abbreviations_list() - Alias di DateTimeZone::listAbbreviations

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User Contributed Notes 3 notes

down

kalle at example dot com ¶

8 years ago


Even though the manual currently says that the first parameter has to be "One of DateTimeZone class constants", you may actually combine these constants:

<?php
  $a = DateTimeZone::listIdentifiers(DateTimeZone::AFRICA); //gives africa time zones
  $b = DateTimeZone::listIdentifiers(DateTimeZone::AMERICA); //gives american time zones
  $c = DateTimeZone::listIdentifiers(DateTimeZone::AFRICA | DateTimeZone::AMERICA); //gives both african and american time zones
?>

Be sure to use |, not ||.

down

repohelga at example dot com ¶

5 years ago


Beware that the ISO 3166-1 country code passed to second parameter $country has to be in capital letters (eg. 'US', 'DE', ...).
Passing the country code in lower case like 'us' or 'de' will not return the failure-value false but just an empty array.

down

PHP Guru ¶

4 years ago


In tests that I have done, not all time zones are returned by this function. For example the following aliases Asia/Katmandu and Asia/Calcutta are not returned, but these time zones are supported in tests that I have done such as the following:

<?php
echo date_default_timezone_set('Asia/Calcutta');
?>

result:

Fri, 19 Jun 2020 03:26:52 +0530

UTC+05:30 is the correct time zone for Calcutta.

Asia/Katmandu and Asia/Calcutta are aliases for Asia/Kathmandu and Asia/Kolkata respectively (which can be found in the list)

Hopefully this helps some people because without these time zones appearing in the list one might not know that they are supported or even exist.

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