PHP DateTimeZone - listIdentifiers() Method
The PHP DateTimeZone::listIdentifiers() method returns a numerically indexed array containing all defined timezone identifiers. The timezone_identifiers_list() function is an alias of this method.
Syntax
//Object-oriented style public DateTimeZone::listIdentifiers(timezoneGroup, countryCode) //Procedural style timezone_identifiers_list(timezoneGroup, countryCode)
Parameters
timezoneGroup |
Optional. Specify one of the DateTimeZone class constants (or a combination). Default is DateTimeZone::ALL. |
countryCode |
Optional. Specify a two-letter ISO 3166-1 compatible country code. This option is only used when timezoneGroup is set to DateTimeZone::PER_COUNTRY. |
Return Value
Returns the array of timezone identifiers.
Example: using both styles
The example below shows the usage of DateTimeZone::listIdentifiers() method.
<?php
//getting the timezone identifiers using Object-oriented
//style and displaying few identifiers
$retval1 = DateTimeZone::listIdentifiers();
for ($i=0; $i < 10; $i++) {
echo "$retval1[$i]\n";
}
echo "-------------------\n";
//getting the timezone identifiers using Procedural
//style and displaying few identifiers
$retval2 = timezone_identifiers_list();
for ($i=100; $i < 110; $i++) {
echo "$retval2[$i]\n";
}
?>
The output of the above code will be:
Africa/Abidjan Africa/Accra Africa/Addis_Ababa Africa/Algiers Africa/Asmara Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre ------------------- America/Eirunepe America/El_Salvador America/Fort_Nelson America/Fortaleza America/Glace_Bay America/Goose_Bay America/Grand_Turk America/Grenada America/Guadeloupe America/Guatemala
Example: using timezoneGroup and countryCode parameters
The timezoneGroup parameter can be specified as one of the DateTimeZone class constants and countryCode can be specified as two-letter ISO 3166-1 compatible country code. Consider the example below:
<?php
//getting the timezone identifiers for Europe
//timezoneGroup and displaying few identifiers
$retval = DateTimeZone::listIdentifiers(128);
for ($i=0; $i < 10; $i++) {
echo "$retval[$i]\n";
}
echo "-------------------\n";
//getting the timezone identifiers for USA
print_r(DateTimeZone::listIdentifiers(4096, "US"));
?>
The output of the above code will be:
Europe/Amsterdam
Europe/Andorra
Europe/Astrakhan
Europe/Athens
Europe/Belgrade
Europe/Berlin
Europe/Bratislava
Europe/Brussels
Europe/Bucharest
Europe/Budapest
-------------------
Array
(
[0] => America/Adak
[1] => America/Anchorage
[2] => America/Boise
[3] => America/Chicago
[4] => America/Denver
[5] => America/Detroit
[6] => America/Indiana/Indianapolis
[7] => America/Indiana/Knox
[8] => America/Indiana/Marengo
[9] => America/Indiana/Petersburg
[10] => America/Indiana/Tell_City
[11] => America/Indiana/Vevay
[12] => America/Indiana/Vincennes
[13] => America/Indiana/Winamac
[14] => America/Juneau
[15] => America/Kentucky/Louisville
[16] => America/Kentucky/Monticello
[17] => America/Los_Angeles
[18] => America/Menominee
[19] => America/Metlakatla
[20] => America/New_York
[21] => America/Nome
[22] => America/North_Dakota/Beulah
[23] => America/North_Dakota/Center
[24] => America/North_Dakota/New_Salem
[25] => America/Phoenix
[26] => America/Sitka
[27] => America/Yakutat
[28] => Pacific/Honolulu
)
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