Generieren einer Dropdown-Liste von Zeitzonen mit PHP

Die meisten Websites benötigen eine Möglichkeit, die Daten auf der Website in der vom Benutzer bevorzugten Zeitzone anzuzeigen. Unten sind zwei Listen aufgeführt , die ich gefunden habe, und dann eine Methode , die die in PHP 5 integrierte PHP DateTime- Klasse verwendet.

Ich brauche Hilfe, um zu wissen, welche davon am besten geeignet ist, um den UTC-Offset vom registrierten Benutzer zu erhalten.

Einer:

<option value="-12">[UTC - 12] Baker Island Time</option>
<option value="-11">[UTC - 11] Niue Time, Samoa Standard Time</option>
<option value="-10">[UTC - 10] Hawaii-Aleutian Standard Time, Cook Island Time</option>
<option value="-9.5">[UTC - 9:30] Marquesas Islands Time</option>
<option value="-9">[UTC - 9] Alaska Standard Time, Gambier Island Time</option>
<option value="-8">[UTC - 8] Pacific Standard Time</option>
<option value="-7">[UTC - 7] Mountain Standard Time</option>
<option value="-6">[UTC - 6] Central Standard Time</option>
<option value="-5">[UTC - 5] Eastern Standard Time</option>
<option value="-4.5">[UTC - 4:30] Venezuelan Standard Time</option>
<option value="-4">[UTC - 4] Atlantic Standard Time</option>
<option value="-3.5">[UTC - 3:30] Newfoundland Standard Time</option>
<option value="-3">[UTC - 3] Amazon Standard Time, Central Greenland Time</option>
<option value="-2">[UTC - 2] Fernando de Noronha Time, South Georgia &amp; the South Sandwich Islands Time</option>
<option value="-1">[UTC - 1] Azores Standard Time, Cape Verde Time, Eastern Greenland Time</option>
<option value="0" selected="selected">[UTC] Western European Time, Greenwich Mean Time</option>
<option value="1">[UTC + 1] Central European Time, West African Time</option>
<option value="2">[UTC + 2] Eastern European Time, Central African Time</option>
<option value="3">[UTC + 3] Moscow Standard Time, Eastern African Time</option>
<option value="3.5">[UTC + 3:30] Iran Standard Time</option>
<option value="4">[UTC + 4] Gulf Standard Time, Samara Standard Time</option>
<option value="4.5">[UTC + 4:30] Afghanistan Time</option>
<option value="5">[UTC + 5] Pakistan Standard Time, Yekaterinburg Standard Time</option>
<option value="5.5">[UTC + 5:30] Indian Standard Time, Sri Lanka Time</option>
<option value="5.75">[UTC + 5:45] Nepal Time</option>
<option value="6">[UTC + 6] Bangladesh Time, Bhutan Time, Novosibirsk Standard Time</option>
<option value="6.5">[UTC + 6:30] Cocos Islands Time, Myanmar Time</option>
<option value="7">[UTC + 7] Indochina Time, Krasnoyarsk Standard Time</option>
<option value="8">[UTC + 8] Chinese Standard Time, Australian Western Standard Time, Irkutsk Standard Time</option>
<option value="8.75">[UTC + 8:45] Southeastern Western Australia Standard Time</option>
<option value="9">[UTC + 9] Japan Standard Time, Korea Standard Time, Chita Standard Time</option>
<option value="9.5">[UTC + 9:30] Australian Central Standard Time</option>
<option value="10">[UTC + 10] Australian Eastern Standard Time, Vladivostok Standard Time</option>
<option value="10.5">[UTC + 10:30] Lord Howe Standard Time</option>
<option value="11">[UTC + 11] Solomon Island Time, Magadan Standard Time</option>
<option value="11.5">[UTC + 11:30] Norfolk Island Time</option>
<option value="12">[UTC + 12] New Zealand Time, Fiji Time, Kamchatka Standard Time</option>
<option value="12.75">[UTC + 12:45] Chatham Islands Time</option>
<option value="13">[UTC + 13] Tonga Time, Phoenix Islands Time</option>
<option value="14">[UTC + 14] Line Island Time</option>

Oder mit PHP-freundlichen Werten:

<option value="Pacific/Midway">(GMT-11:00) Midway Island, Samoa</option>
<option value="America/Adak">(GMT-10:00) Hawaii-Aleutian</option>
<option value="Etc/GMT+10">(GMT-10:00) Hawaii</option>
<option value="Pacific/Marquesas">(GMT-09:30) Marquesas Islands</option>
<option value="Pacific/Gambier">(GMT-09:00) Gambier Islands</option>
<option value="America/Anchorage">(GMT-09:00) Alaska</option>
<option value="America/Ensenada">(GMT-08:00) Tijuana, Baja California</option>
<option value="Etc/GMT+8">(GMT-08:00) Pitcairn Islands</option>
<option value="America/Los_Angeles">(GMT-08:00) Pacific Time (US & Canada)</option>
<option value="America/Denver">(GMT-07:00) Mountain Time (US & Canada)</option>
<option value="America/Chihuahua">(GMT-07:00) Chihuahua, La Paz, Mazatlan</option>
<option value="America/Dawson_Creek">(GMT-07:00) Arizona</option>
<option value="America/Belize">(GMT-06:00) Saskatchewan, Central America</option>
<option value="America/Cancun">(GMT-06:00) Guadalajara, Mexico City, Monterrey</option>
<option value="Chile/EasterIsland">(GMT-06:00) Easter Island</option>
<option value="America/Chicago">(GMT-06:00) Central Time (US & Canada)</option>
<option value="America/New_York">(GMT-05:00) Eastern Time (US & Canada)</option>
<option value="America/Havana">(GMT-05:00) Cuba</option>
<option value="America/Bogota">(GMT-05:00) Bogota, Lima, Quito, Rio Branco</option>
<option value="America/Caracas">(GMT-04:30) Caracas</option>
<option value="America/Santiago">(GMT-04:00) Santiago</option>
<option value="America/La_Paz">(GMT-04:00) La Paz</option>
<option value="Atlantic/Stanley">(GMT-04:00) Faukland Islands</option>
<option value="America/Campo_Grande">(GMT-04:00) Brazil</option>
<option value="America/Goose_Bay">(GMT-04:00) Atlantic Time (Goose Bay)</option>
<option value="America/Glace_Bay">(GMT-04:00) Atlantic Time (Canada)</option>
<option value="America/St_Johns">(GMT-03:30) Newfoundland</option>
<option value="America/Araguaina">(GMT-03:00) UTC-3</option>
<option value="America/Montevideo">(GMT-03:00) Montevideo</option>
<option value="America/Miquelon">(GMT-03:00) Miquelon, St. Pierre</option>
<option value="America/Godthab">(GMT-03:00) Greenland</option>
<option value="America/Argentina/Buenos_Aires">(GMT-03:00) Buenos Aires</option>
<option value="America/Sao_Paulo">(GMT-03:00) Brasilia</option>
<option value="America/Noronha">(GMT-02:00) Mid-Atlantic</option>
<option value="Atlantic/Cape_Verde">(GMT-01:00) Cape Verde Is.</option>
<option value="Atlantic/Azores">(GMT-01:00) Azores</option>
<option value="Europe/Belfast">(GMT) Greenwich Mean Time : Belfast</option>
<option value="Europe/Dublin">(GMT) Greenwich Mean Time : Dublin</option>
<option value="Europe/Lisbon">(GMT) Greenwich Mean Time : Lisbon</option>
<option value="Europe/London">(GMT) Greenwich Mean Time : London</option>
<option value="Africa/Abidjan">(GMT) Monrovia, Reykjavik</option>
<option value="Europe/Amsterdam">(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna</option>
<option value="Europe/Belgrade">(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague</option>
<option value="Europe/Brussels">(GMT+01:00) Brussels, Copenhagen, Madrid, Paris</option>
<option value="Africa/Algiers">(GMT+01:00) West Central Africa</option>
<option value="Africa/Windhoek">(GMT+01:00) Windhoek</option>
<option value="Asia/Beirut">(GMT+02:00) Beirut</option>
<option value="Africa/Cairo">(GMT+02:00) Cairo</option>
<option value="Asia/Gaza">(GMT+02:00) Gaza</option>
<option value="Africa/Blantyre">(GMT+02:00) Harare, Pretoria</option>
<option value="Asia/Jerusalem">(GMT+02:00) Jerusalem</option>
<option value="Europe/Minsk">(GMT+02:00) Minsk</option>
<option value="Asia/Damascus">(GMT+02:00) Syria</option>
<option value="Europe/Moscow">(GMT+03:00) Moscow, St. Petersburg, Volgograd</option>
<option value="Africa/Addis_Ababa">(GMT+03:00) Nairobi</option>
<option value="Asia/Tehran">(GMT+03:30) Tehran</option>
<option value="Asia/Dubai">(GMT+04:00) Abu Dhabi, Muscat</option>
<option value="Asia/Yerevan">(GMT+04:00) Yerevan</option>
<option value="Asia/Kabul">(GMT+04:30) Kabul</option>
<option value="Asia/Yekaterinburg">(GMT+05:00) Ekaterinburg</option>
<option value="Asia/Tashkent">(GMT+05:00) Tashkent</option>
<option value="Asia/Kolkata">(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi</option>
<option value="Asia/Katmandu">(GMT+05:45) Kathmandu</option>
<option value="Asia/Dhaka">(GMT+06:00) Astana, Dhaka</option>
<option value="Asia/Novosibirsk">(GMT+06:00) Novosibirsk</option>
<option value="Asia/Rangoon">(GMT+06:30) Yangon (Rangoon)</option>
<option value="Asia/Bangkok">(GMT+07:00) Bangkok, Hanoi, Jakarta</option>
<option value="Asia/Krasnoyarsk">(GMT+07:00) Krasnoyarsk</option>
<option value="Asia/Hong_Kong">(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi</option>
<option value="Asia/Irkutsk">(GMT+08:00) Irkutsk, Ulaan Bataar</option>
<option value="Australia/Perth">(GMT+08:00) Perth</option>
<option value="Australia/Eucla">(GMT+08:45) Eucla</option>
<option value="Asia/Tokyo">(GMT+09:00) Osaka, Sapporo, Tokyo</option>
<option value="Asia/Seoul">(GMT+09:00) Seoul</option>
<option value="Asia/Yakutsk">(GMT+09:00) Yakutsk</option>
<option value="Australia/Adelaide">(GMT+09:30) Adelaide</option>
<option value="Australia/Darwin">(GMT+09:30) Darwin</option>
<option value="Australia/Brisbane">(GMT+10:00) Brisbane</option>
<option value="Australia/Hobart">(GMT+10:00) Hobart</option>
<option value="Asia/Vladivostok">(GMT+10:00) Vladivostok</option>
<option value="Australia/Lord_Howe">(GMT+10:30) Lord Howe Island</option>
<option value="Etc/GMT-11">(GMT+11:00) Solomon Is., New Caledonia</option>
<option value="Asia/Magadan">(GMT+11:00) Magadan</option>
<option value="Pacific/Norfolk">(GMT+11:30) Norfolk Island</option>
<option value="Asia/Anadyr">(GMT+12:00) Anadyr, Kamchatka</option>
<option value="Pacific/Auckland">(GMT+12:00) Auckland, Wellington</option>
<option value="Etc/GMT-12">(GMT+12:00) Fiji, Kamchatka, Marshall Is.</option>
<option value="Pacific/Chatham">(GMT+12:45) Chatham Islands</option>
<option value="Pacific/Tongatapu">(GMT+13:00) Nuku'alofa</option>
<option value="Pacific/Kiritimati">(GMT+14:00) Kiritimati</option>

Oder einfach nur PHP selbst verwenden:

$timezones = DateTimeZone::listAbbreviations();

$cities = array();
foreach( $timezones as $key => $zones )
{
    foreach( $zones as $id => $zone )
    {
        /**
         * Only get timezones explicitely not part of "Others".
         * @see http://www.php.net/manual/en/timezones.others.php
         */
        if ( preg_match( '/^(America|Antartica|Arctic|Asia|Atlantic|Europe|Indian|Pacific)\//', $zone['timezone_id'] ) 
            && $zone['timezone_id']) {
            $cities[$zone['timezone_id']][] = $key;
        }
    }
}

// For each city, have a comma separated list of all possible timezones for that city.
foreach( $cities as $key => $value )
    $cities[$key] = join( ', ', $value);

// Only keep one city (the first and also most important) for each set of possibilities. 
$cities = array_unique( $cities );

// Sort by area/city name.
ksort( $cities );

Es scheint, als wäre das letzte das sicherste, da es mit der verwendeten PHP-Version wachsen würde. Sie können dieses Array auch bei Bedarf umdrehen, um Zeitzonen mit Städtenamen zu verknüpfen.

Ich würde es in PHP tun, außer ich würde es manchmal vermeiden, preg_match 100 zu machen und dies tun, um Ihre Liste zu generieren.

$tzlist = DateTimeZone::listIdentifiers(DateTimeZone::ALL);

Außerdem würde ich die Namen von PHP für die 'Zeitzonen' verwenden und GMT-Offsets vergessen, die sich basierend auf der Sommerzeit ändern werden. Code wie dieser in phpbb ist nur so b / c, dass sie immer noch PHP4 unterstützen und sich nicht darauf verlassen können, dass die DateTime- oder DateTimeZone-Objekte vorhanden sind.

Nach dem obigen Beispiel von user210179 habe ich die folgende Funktion geschrieben, um eine Liste aller Zeitzonen mit ihren Offsets zu generieren:

function generate_timezone_list()
{
    static $regions = array(
        DateTimeZone::AFRICA,
        DateTimeZone::AMERICA,
        DateTimeZone::ANTARCTICA,
        DateTimeZone::ASIA,
        DateTimeZone::ATLANTIC,
        DateTimeZone::AUSTRALIA,
        DateTimeZone::EUROPE,
        DateTimeZone::INDIAN,
        DateTimeZone::PACIFIC,
    );

    $timezones = array();
    foreach( $regions as $region )
    {
        $timezones = array_merge( $timezones, DateTimeZone::listIdentifiers( $region ) );
    }

    $timezone_offsets = array();
    foreach( $timezones as $timezone )
    {
        $tz = new DateTimeZone($timezone);
        $timezone_offsets[$timezone] = $tz->getOffset(new DateTime);
    }

    // sort timezone by offset
    asort($timezone_offsets);

    $timezone_list = array();
    foreach( $timezone_offsets as $timezone => $offset )
    {
        $offset_prefix = $offset < 0 ? '-' : '+';
        $offset_formatted = gmdate( 'H:i', abs($offset) );

        $pretty_offset = "UTC${offset_prefix}${offset_formatted}";

        $timezone_list[$timezone] = "(${pretty_offset}) $timezone";
    }

    return $timezone_list;
}

Dadurch wird ein Array generiert, das wie folgt aussieht:

[Pacific/Midway] => (UTC-11:00) Pacific/Midway
[Pacific/Pago_Pago] => (UTC-11:00) Pacific/Pago_Pago
[Pacific/Niue] => (UTC-11:00) Pacific/Niue
[Pacific/Honolulu] => (UTC-10:00) Pacific/Honolulu
[Pacific/Fakaofo] => (UTC-10:00) Pacific/Fakaofo
…

Es ist derzeit nach Offsets sortiert, aber Sie können einfach nach dem Namen der Zeitzone sortieren, indem Sie ein ksort()anstelle von ausführen asort().

Trotz der Anzahl der vorhandenen Antworten habe ich eine weitere Lösung für dieses Problem gefunden. Die Profis meiner Implementierung sind:

• Die Liste der Zeitzonen wird dynamisch generiert und aktualisiert sich daher automatisch, wenn sich Zeitzonen ändern (in PHP).
• Zeitzonennamen werden verschönert. Zum Beispiel wird "America / St_Barthelemy" zu "America, St. Barthelemy".
• Zeitzonen sind nach Versatz und Name sortiert. Tolands Antwort wird nur nach Versatz sortiert, was zu unsortierten Gruppen von Zeitzonen innerhalb desselben Versatzes führt.
• Versatzinformationen werden nicht abgerufen DateTimeZone::listAbbreviations, da diese Methode auch historische Zeitzoneninformationen zurückgibt . Favios Antwort verwendet diese Methode, was zu falschen (historischen) Offsets führt
• Die Liste der Zeitzonen wird nur bei der ersten Anforderung generiert (und mithilfe einer statischen Variablen zwischengespeichert).

Hier ist der vollständige Code:

function timezone_list() {
    static $timezones = null;

    if ($timezones === null) {
        $timezones = [];
        $offsets = [];
        $now = new DateTime('now', new DateTimeZone('UTC'));

        foreach (DateTimeZone::listIdentifiers() as $timezone) {
            $now->setTimezone(new DateTimeZone($timezone));
            $offsets[] = $offset = $now->getOffset();
            $timezones[$timezone] = '(' . format_GMT_offset($offset) . ') ' . format_timezone_name($timezone);
        }

        array_multisort($offsets, $timezones);
    }

    return $timezones;
}

function format_GMT_offset($offset) {
    $hours = intval($offset / 3600);
    $minutes = abs(intval($offset % 3600 / 60));
    return 'GMT' . ($offset ? sprintf('%+03d:%02d', $hours, $minutes) : '');
}

function format_timezone_name($name) {
    $name = str_replace('/', ', ', $name);
    $name = str_replace('_', ' ', $name);
    $name = str_replace('St ', 'St. ', $name);
    return $name;
}

Und hier ist ein Beispiel für die Ausgabe

Array
(
    [Pacific/Midway]    => (GMT-11:00) Pacific, Midway
    [Pacific/Niue]      => (GMT-11:00) Pacific, Niue
    [Pacific/Pago_Pago] => (GMT-11:00) Pacific, Pago Pago
    [America/Adak]      => (GMT-10:00) America, Adak
    [Pacific/Honolulu]  => (GMT-10:00) Pacific, Honolulu
    [Pacific/Johnston]  => (GMT-10:00) Pacific, Johnston
    [Pacific/Rarotonga] => (GMT-10:00) Pacific, Rarotonga
    [Pacific/Tahiti]    => (GMT-10:00) Pacific, Tahiti
    [Pacific/Marquesas] => (GMT-09:30) Pacific, Marquesas
    [America/Anchorage] => (GMT-09:00) America, Anchorage
    ...
)

Ich würde es mit dem folgenden Code machen, der der akzeptierten Antwort ähnlich ist (ich bin mir bewusst, dass der Code überarbeitet werden könnte :)):

    $list = DateTimeZone::listAbbreviations();
    $idents = DateTimeZone::listIdentifiers();

    $data = $offset = $added = array();
    foreach ($list as $abbr => $info) {
        foreach ($info as $zone) {
            if ( ! empty($zone['timezone_id'])
                AND
                ! in_array($zone['timezone_id'], $added)
                AND 
                  in_array($zone['timezone_id'], $idents)) {
                $z = new DateTimeZone($zone['timezone_id']);
                $c = new DateTime(null, $z);
                $zone['time'] = $c->format('H:i a');
                $offset[] = $zone['offset'] = $z->getOffset($c);
                $data[] = $zone;
                $added[] = $zone['timezone_id'];
            }
        }
    }

    array_multisort($offset, SORT_ASC, $data);
    $options = array();
    foreach ($data as $key => $row) {
        $options[$row['timezone_id']] = $row['time'] . ' - '
                                        . formatOffset($row['offset']) 
                                        . ' ' . $row['timezone_id'];
    }

    // now you can use $options;

function formatOffset($offset) {
        $hours = $offset / 3600;
        $remainder = $offset % 3600;
        $sign = $hours > 0 ? '+' : '-';
        $hour = (int) abs($hours);
        $minutes = (int) abs($remainder / 60);

        if ($hour == 0 AND $minutes == 0) {
            $sign = ' ';
        }
        return 'GMT' . $sign . str_pad($hour, 2, '0', STR_PAD_LEFT) 
                .':'. str_pad($minutes,2, '0');

}

Es produziert so etwas wie:

<option value="America/Boise" label="02:10 am - GMT-06:00 America/Boise">02:10 am - GMT-06:00 America/Boise</option>

<option value="America/Denver" label="02:10 am - GMT-06:00 America/Denver">02:10 am - GMT-06:00 America/Denver</option>
<option value="America/Edmonton" label="02:10 am - GMT-06:00 America/Edmonton">02:10 am - GMT-06:00 America/Edmonton</option>
<option value="America/Inuvik" label="02:10 am - GMT-06:00 America/Inuvik">02:10 am - GMT-06:00 America/Inuvik</option>
<option value="America/Shiprock" label="02:10 am - GMT-06:00 America/Shiprock">02:10 am - GMT-06:00 America/Shiprock</option>

<option value="America/Belize" label="02:10 am - GMT-05:00 America/Belize">02:10 am - GMT-05:00 America/Belize</option>

Hoffe, das hilft ein bisschen und / oder inspiriert dich, mit etwas Besserem zu kommen.

Sie können sehr einfach ein Dropdown-Menü aus diesem Array erstellen (es war eine zeitaufwändige Aufgabe, dies zusammenzustellen und zu testen). Wir verwenden diese Liste bereits in einigen unserer Apps.

Aufgrund der Sommerzeit ist es sehr wichtig , Zeitzonen-IDs in Ihrer Datenbank zu speichern und nicht nur den Zeitzonenversatz wie "GMT + 2".

AKTUALISIEREN

Ich habe die Liste der Zeitzonen aktualisiert / korrigiert (auch zur Kasse: https://github.com/paptamas/timezones ):

<?php
$timezones = array (
'(GMT-11:00) Midway Island' => 'Pacific/Midway',
'(GMT-11:00) Samoa' => 'Pacific/Samoa',
'(GMT-10:00) Hawaii' => 'Pacific/Honolulu',
'(GMT-09:00) Alaska' => 'US/Alaska',
'(GMT-08:00) Pacific Time (US &amp; Canada)' => 'America/Los_Angeles',
'(GMT-08:00) Tijuana' => 'America/Tijuana',
'(GMT-07:00) Arizona' => 'US/Arizona',
'(GMT-07:00) Chihuahua' => 'America/Chihuahua',
'(GMT-07:00) La Paz' => 'America/Chihuahua',
'(GMT-07:00) Mazatlan' => 'America/Mazatlan',
'(GMT-07:00) Mountain Time (US &amp; Canada)' => 'US/Mountain',
'(GMT-06:00) Central America' => 'America/Managua',
'(GMT-06:00) Central Time (US &amp; Canada)' => 'US/Central',
'(GMT-06:00) Guadalajara' => 'America/Mexico_City',
'(GMT-06:00) Mexico City' => 'America/Mexico_City',
'(GMT-06:00) Monterrey' => 'America/Monterrey',
'(GMT-06:00) Saskatchewan' => 'Canada/Saskatchewan',
'(GMT-05:00) Bogota' => 'America/Bogota',
'(GMT-05:00) Eastern Time (US &amp; Canada)' => 'US/Eastern',
'(GMT-05:00) Indiana (East)' => 'US/East-Indiana',
'(GMT-05:00) Lima' => 'America/Lima',
'(GMT-05:00) Quito' => 'America/Bogota',
'(GMT-04:00) Atlantic Time (Canada)' => 'Canada/Atlantic',
'(GMT-04:30) Caracas' => 'America/Caracas',
'(GMT-04:00) La Paz' => 'America/La_Paz',
'(GMT-04:00) Santiago' => 'America/Santiago',
'(GMT-03:30) Newfoundland' => 'Canada/Newfoundland',
'(GMT-03:00) Brasilia' => 'America/Sao_Paulo',
'(GMT-03:00) Buenos Aires' => 'America/Argentina/Buenos_Aires',
'(GMT-03:00) Georgetown' => 'America/Argentina/Buenos_Aires',
'(GMT-03:00) Greenland' => 'America/Godthab',
'(GMT-02:00) Mid-Atlantic' => 'America/Noronha',
'(GMT-01:00) Azores' => 'Atlantic/Azores',
'(GMT-01:00) Cape Verde Is.' => 'Atlantic/Cape_Verde',
'(GMT+00:00) Casablanca' => 'Africa/Casablanca',
'(GMT+00:00) Edinburgh' => 'Europe/London',
'(GMT+00:00) Greenwich Mean Time : Dublin' => 'Etc/Greenwich',
'(GMT+00:00) Lisbon' => 'Europe/Lisbon',
'(GMT+00:00) London' => 'Europe/London',
'(GMT+00:00) Monrovia' => 'Africa/Monrovia',
'(GMT+00:00) UTC' => 'UTC',
'(GMT+01:00) Amsterdam' => 'Europe/Amsterdam',
'(GMT+01:00) Belgrade' => 'Europe/Belgrade',
'(GMT+01:00) Berlin' => 'Europe/Berlin',
'(GMT+01:00) Bern' => 'Europe/Berlin',
'(GMT+01:00) Bratislava' => 'Europe/Bratislava',
'(GMT+01:00) Brussels' => 'Europe/Brussels',
'(GMT+01:00) Budapest' => 'Europe/Budapest',
'(GMT+01:00) Copenhagen' => 'Europe/Copenhagen',
'(GMT+01:00) Ljubljana' => 'Europe/Ljubljana',
'(GMT+01:00) Madrid' => 'Europe/Madrid',
'(GMT+01:00) Paris' => 'Europe/Paris',
'(GMT+01:00) Prague' => 'Europe/Prague',
'(GMT+01:00) Rome' => 'Europe/Rome',
'(GMT+01:00) Sarajevo' => 'Europe/Sarajevo',
'(GMT+01:00) Skopje' => 'Europe/Skopje',
'(GMT+01:00) Stockholm' => 'Europe/Stockholm',
'(GMT+01:00) Vienna' => 'Europe/Vienna',
'(GMT+01:00) Warsaw' => 'Europe/Warsaw',
'(GMT+01:00) West Central Africa' => 'Africa/Lagos',
'(GMT+01:00) Zagreb' => 'Europe/Zagreb',
'(GMT+02:00) Athens' => 'Europe/Athens',
'(GMT+02:00) Bucharest' => 'Europe/Bucharest',
'(GMT+02:00) Cairo' => 'Africa/Cairo',
'(GMT+02:00) Harare' => 'Africa/Harare',
'(GMT+02:00) Helsinki' => 'Europe/Helsinki',
'(GMT+02:00) Istanbul' => 'Europe/Istanbul',
'(GMT+02:00) Jerusalem' => 'Asia/Jerusalem',
'(GMT+02:00) Kyiv' => 'Europe/Helsinki',
'(GMT+02:00) Pretoria' => 'Africa/Johannesburg',
'(GMT+02:00) Riga' => 'Europe/Riga',
'(GMT+02:00) Sofia' => 'Europe/Sofia',
'(GMT+02:00) Tallinn' => 'Europe/Tallinn',
'(GMT+02:00) Vilnius' => 'Europe/Vilnius',
'(GMT+03:00) Baghdad' => 'Asia/Baghdad',
'(GMT+03:00) Kuwait' => 'Asia/Kuwait',
'(GMT+03:00) Minsk' => 'Europe/Minsk',
'(GMT+03:00) Nairobi' => 'Africa/Nairobi',
'(GMT+03:00) Riyadh' => 'Asia/Riyadh',
'(GMT+03:00) Volgograd' => 'Europe/Volgograd',
'(GMT+03:30) Tehran' => 'Asia/Tehran',
'(GMT+04:00) Abu Dhabi' => 'Asia/Muscat',
'(GMT+04:00) Baku' => 'Asia/Baku',
'(GMT+04:00) Moscow' => 'Europe/Moscow',
'(GMT+04:00) Muscat' => 'Asia/Muscat',
'(GMT+04:00) St. Petersburg' => 'Europe/Moscow',
'(GMT+04:00) Tbilisi' => 'Asia/Tbilisi',
'(GMT+04:00) Yerevan' => 'Asia/Yerevan',
'(GMT+04:30) Kabul' => 'Asia/Kabul',
'(GMT+05:00) Islamabad' => 'Asia/Karachi',
'(GMT+05:00) Karachi' => 'Asia/Karachi',
'(GMT+05:00) Tashkent' => 'Asia/Tashkent',
'(GMT+05:30) Chennai' => 'Asia/Calcutta',
'(GMT+05:30) Kolkata' => 'Asia/Kolkata',
'(GMT+05:30) Mumbai' => 'Asia/Calcutta',
'(GMT+05:30) New Delhi' => 'Asia/Calcutta',
'(GMT+05:30) Sri Jayawardenepura' => 'Asia/Calcutta',
'(GMT+05:45) Kathmandu' => 'Asia/Katmandu',
'(GMT+06:00) Almaty' => 'Asia/Almaty',
'(GMT+06:00) Astana' => 'Asia/Dhaka',
'(GMT+06:00) Dhaka' => 'Asia/Dhaka',
'(GMT+06:00) Ekaterinburg' => 'Asia/Yekaterinburg',
'(GMT+06:30) Rangoon' => 'Asia/Rangoon',
'(GMT+07:00) Bangkok' => 'Asia/Bangkok',
'(GMT+07:00) Hanoi' => 'Asia/Bangkok',
'(GMT+07:00) Jakarta' => 'Asia/Jakarta',
'(GMT+07:00) Novosibirsk' => 'Asia/Novosibirsk',
'(GMT+08:00) Beijing' => 'Asia/Hong_Kong',
'(GMT+08:00) Chongqing' => 'Asia/Chongqing',
'(GMT+08:00) Hong Kong' => 'Asia/Hong_Kong',
'(GMT+08:00) Krasnoyarsk' => 'Asia/Krasnoyarsk',
'(GMT+08:00) Kuala Lumpur' => 'Asia/Kuala_Lumpur',
'(GMT+08:00) Perth' => 'Australia/Perth',
'(GMT+08:00) Singapore' => 'Asia/Singapore',
'(GMT+08:00) Taipei' => 'Asia/Taipei',
'(GMT+08:00) Ulaan Bataar' => 'Asia/Ulan_Bator',
'(GMT+08:00) Urumqi' => 'Asia/Urumqi',
'(GMT+09:00) Irkutsk' => 'Asia/Irkutsk',
'(GMT+09:00) Osaka' => 'Asia/Tokyo',
'(GMT+09:00) Sapporo' => 'Asia/Tokyo',
'(GMT+09:00) Seoul' => 'Asia/Seoul',
'(GMT+09:00) Tokyo' => 'Asia/Tokyo',
'(GMT+09:30) Adelaide' => 'Australia/Adelaide',
'(GMT+09:30) Darwin' => 'Australia/Darwin',
'(GMT+10:00) Brisbane' => 'Australia/Brisbane',
'(GMT+10:00) Canberra' => 'Australia/Canberra',
'(GMT+10:00) Guam' => 'Pacific/Guam',
'(GMT+10:00) Hobart' => 'Australia/Hobart',
'(GMT+10:00) Melbourne' => 'Australia/Melbourne',
'(GMT+10:00) Port Moresby' => 'Pacific/Port_Moresby',
'(GMT+10:00) Sydney' => 'Australia/Sydney',
'(GMT+10:00) Yakutsk' => 'Asia/Yakutsk',
'(GMT+11:00) Vladivostok' => 'Asia/Vladivostok',
'(GMT+12:00) Auckland' => 'Pacific/Auckland',
'(GMT+12:00) Fiji' => 'Pacific/Fiji',
'(GMT+12:00) International Date Line West' => 'Pacific/Kwajalein',
'(GMT+12:00) Kamchatka' => 'Asia/Kamchatka',
'(GMT+12:00) Magadan' => 'Asia/Magadan',
'(GMT+12:00) Marshall Is.' => 'Pacific/Fiji',
'(GMT+12:00) New Caledonia' => 'Asia/Magadan',
'(GMT+12:00) Solomon Is.' => 'Asia/Magadan',
'(GMT+12:00) Wellington' => 'Pacific/Auckland',
'(GMT+13:00) Nuku\'alofa' => 'Pacific/Tongatapu'
);
?>   

Das Bearbeiten der Antwort von Tamas, um alle "anderen" Einträge zu entfernen, die auf der Website php.net angegeben sind, sollte nicht mehr verwendet werden.

Vielleicht spielt es keine Rolle, sondern nur die Best Practices zu befolgen. Siehe Hinweis unten unter: http://fr2.php.net/manual/en/timezones.others.php

Auch wenn diese Liste die Azoren als GMT -1 enthält, denke ich, dass sie (zumindest manchmal) mit GMT identisch ist, aber nicht sicher.

Bearbeiten, um dies in SQL anzubieten, damit Sie die Dropdown-Liste in einem Formular erstellen und die Antwort des Benutzers stattdessen an einen Index binden können.

Erneut bearbeiten, um führenden Platz zu entfernen

CREATE TABLE IF NOT EXISTS `timezones` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(44) DEFAULT NULL,
  `timezone` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 AUTO_INCREMENT=141 ;

--
-- Dumping data for table `timezones`
--

INSERT INTO `timezones` (`id`, `name`, `timezone`) VALUES
(1, '(GMT-11:00) Midway Island ', 'Pacific/Midway'),
(2, '(GMT-11:00) Samoa ', 'Pacific/Samoa'),
(3, '(GMT-10:00) Hawaii ', 'Pacific/Honolulu'),
(4, '(GMT-09:00) Alaska ', 'America/Anchorage'),
(5, '(GMT-08:00) Pacific Time (US & Canada) ', 'America/Los_Angeles'),
(6, '(GMT-08:00) Tijuana ', 'America/Tijuana'),
(7, '(GMT-07:00) Chihuahua ', 'America/Chihuahua'),
(8, '(GMT-07:00) La Paz ', 'America/Chihuahua'),
(9, '(GMT-07:00) Mazatlan ', 'America/Mazatlan'),
(10, '(GMT-07:00) Mountain Time (US & Canada) ', 'America/Denver'),
(11, '(GMT-06:00) Central America ', 'America/Managua'),
(12, '(GMT-06:00) Central Time (US & Canada) ', 'America/Chicago'),
(13, '(GMT-06:00) Guadalajara ', 'America/Mexico_City'),
(14, '(GMT-06:00) Mexico City ', 'America/Mexico_City'),
(15, '(GMT-06:00) Monterrey ', 'America/Monterrey'),
(16, '(GMT-05:00) Bogota ', 'America/Bogota'),
(17, '(GMT-05:00) Eastern Time (US & Canada) ', 'America/New_York'),
(18, '(GMT-05:00) Lima ', 'America/Lima'),
(19, '(GMT-05:00) Quito ', 'America/Bogota'),
(20, '(GMT-04:00) Atlantic Time (Canada) ', 'Canada/Atlantic'),
(21, '(GMT-04:30) Caracas ', 'America/Caracas'),
(22, '(GMT-04:00) La Paz ', 'America/La_Paz'),
(23, '(GMT-04:00) Santiago ', 'America/Santiago'),
(24, '(GMT-03:30) Newfoundland ', 'America/St_Johns'),
(25, '(GMT-03:00) Brasilia ', 'America/Sao_Paulo'),
(26, '(GMT-03:00) Buenos Aires ', 'America/Argentina/Buenos_Aires'),
(27, '(GMT-03:00) Georgetown ', 'America/Argentina/Buenos_Aires'),
(28, '(GMT-03:00) Greenland ', 'America/Godthab'),
(29, '(GMT-02:00) Mid-Atlantic ', 'America/Noronha'),
(30, '(GMT-01:00) Azores ', 'Atlantic/Azores'),
(31, '(GMT-01:00) Cape Verde Is. ', 'Atlantic/Cape_Verde'),
(32, '(GMT+00:00) Casablanca ', 'Africa/Casablanca'),
(33, '(GMT+00:00) Edinburgh ', 'Europe/London'),
(34, '(GMT+00:00) Dublin ', 'Europe/Dublin'),
(35, '(GMT+00:00) Lisbon ', 'Europe/Lisbon'),
(36, '(GMT+00:00) London ', 'Europe/London'),
(37, '(GMT+00:00) Monrovia ', 'Africa/Monrovia'),
(38, '(GMT+00:00) UTC ', 'UTC'),
(39, '(GMT+01:00) Amsterdam ', 'Europe/Amsterdam'),
(40, '(GMT+01:00) Belgrade ', 'Europe/Belgrade'),
(41, '(GMT+01:00) Berlin ', 'Europe/Berlin'),
(42, '(GMT+01:00) Bern ', 'Europe/Berlin'),
(43, '(GMT+01:00) Bratislava ', 'Europe/Bratislava'),
(44, '(GMT+01:00) Brussels ', 'Europe/Brussels'),
(45, '(GMT+01:00) Budapest ', 'Europe/Budapest'),
(46, '(GMT+01:00) Copenhagen ', 'Europe/Copenhagen'),
(47, '(GMT+01:00) Ljubljana ', 'Europe/Ljubljana'),
(48, '(GMT+01:00) Madrid ', 'Europe/Madrid'),
(49, '(GMT+01:00) Paris ', 'Europe/Paris'),
(50, '(GMT+01:00) Prague ', 'Europe/Prague'),
(51, '(GMT+01:00) Rome ', 'Europe/Rome'),
(52, '(GMT+01:00) Sarajevo ', 'Europe/Sarajevo'),
(53, '(GMT+01:00) Skopje ', 'Europe/Skopje'),
(54, '(GMT+01:00) Stockholm ', 'Europe/Stockholm'),
(55, '(GMT+01:00) Vienna ', 'Europe/Vienna'),
(56, '(GMT+01:00) Warsaw ', 'Europe/Warsaw'),
(57, '(GMT+01:00) West Central Africa ', 'Africa/Lagos'),
(58, '(GMT+01:00) Zagreb ', 'Europe/Zagreb'),
(59, '(GMT+02:00) Athens ', 'Europe/Athens'),
(60, '(GMT+02:00) Bucharest ', 'Europe/Bucharest'),
(61, '(GMT+02:00) Cairo ', 'Africa/Cairo'),
(62, '(GMT+02:00) Harare ', 'Africa/Harare'),
(63, '(GMT+02:00) Helsinki ', 'Europe/Helsinki'),
(64, '(GMT+02:00) Istanbul ', 'Europe/Istanbul'),
(65, '(GMT+02:00) Jerusalem ', 'Asia/Jerusalem'),
(66, '(GMT+02:00) Kyiv ', 'Europe/Helsinki'),
(67, '(GMT+02:00) Pretoria ', 'Africa/Johannesburg'),
(68, '(GMT+02:00) Riga ', 'Europe/Riga'),
(69, '(GMT+02:00) Sofia ', 'Europe/Sofia'),
(70, '(GMT+02:00) Tallinn ', 'Europe/Tallinn'),
(71, '(GMT+02:00) Vilnius ', 'Europe/Vilnius'),
(72, '(GMT+03:00) Baghdad ', 'Asia/Baghdad'),
(73, '(GMT+03:00) Kuwait ', 'Asia/Kuwait'),
(74, '(GMT+03:00) Minsk ', 'Europe/Minsk'),
(75, '(GMT+03:00) Nairobi ', 'Africa/Nairobi'),
(76, '(GMT+03:00) Riyadh ', 'Asia/Riyadh'),
(77, '(GMT+03:00) Volgograd ', 'Europe/Volgograd'),
(78, '(GMT+03:30) Tehran ', 'Asia/Tehran'),
(79, '(GMT+04:00) Abu Dhabi ', 'Asia/Muscat'),
(80, '(GMT+04:00) Baku ', 'Asia/Baku'),
(81, '(GMT+04:00) Moscow ', 'Europe/Moscow'),
(82, '(GMT+04:00) Muscat ', 'Asia/Muscat'),
(83, '(GMT+04:00) St. Petersburg ', 'Europe/Moscow'),
(84, '(GMT+04:00) Tbilisi ', 'Asia/Tbilisi'),
(85, '(GMT+04:00) Yerevan ', 'Asia/Yerevan'),
(86, '(GMT+04:30) Kabul ', 'Asia/Kabul'),
(87, '(GMT+05:00) Islamabad ', 'Asia/Karachi'),
(88, '(GMT+05:00) Karachi ', 'Asia/Karachi'),
(89, '(GMT+05:00) Tashkent ', 'Asia/Tashkent'),
(90, '(GMT+05:30) Chennai ', 'Asia/Calcutta'),
(91, '(GMT+05:30) Kolkata ', 'Asia/Kolkata'),
(92, '(GMT+05:30) Mumbai ', 'Asia/Calcutta'),
(93, '(GMT+05:30) New Delhi ', 'Asia/Calcutta'),
(94, '(GMT+05:30) Sri Jayawardenepura ', 'Asia/Calcutta'),
(95, '(GMT+05:45) Kathmandu ', 'Asia/Katmandu'),
(96, '(GMT+06:00) Almaty ', 'Asia/Almaty'),
(97, '(GMT+06:00) Astana ', 'Asia/Dhaka'),
(98, '(GMT+06:00) Dhaka ', 'Asia/Dhaka'),
(99, '(GMT+06:00) Ekaterinburg ', 'Asia/Yekaterinburg'),
(100, '(GMT+06:30) Rangoon ', 'Asia/Rangoon'),
(101, '(GMT+07:00) Bangkok ', 'Asia/Bangkok'),
(102, '(GMT+07:00) Hanoi ', 'Asia/Bangkok'),
(103, '(GMT+07:00) Jakarta ', 'Asia/Jakarta'),
(104, '(GMT+07:00) Novosibirsk ', 'Asia/Novosibirsk'),
(105, '(GMT+08:00) Beijing ', 'Asia/Hong_Kong'),
(106, '(GMT+08:00) Chongqing ', 'Asia/Chongqing'),
(107, '(GMT+08:00) Hong Kong ', 'Asia/Hong_Kong'),
(108, '(GMT+08:00) Krasnoyarsk ', 'Asia/Krasnoyarsk'),
(109, '(GMT+08:00) Kuala Lumpur ', 'Asia/Kuala_Lumpur'),
(110, '(GMT+08:00) Perth ', 'Australia/Perth'),
(111, '(GMT+08:00) Singapore ', 'Asia/Singapore'),
(112, '(GMT+08:00) Taipei ', 'Asia/Taipei'),
(113, '(GMT+08:00) Ulaan Bataar ', 'Asia/Ulan_Bator'),
(114, '(GMT+08:00) Urumqi ', 'Asia/Urumqi'),
(115, '(GMT+09:00) Irkutsk ', 'Asia/Irkutsk'),
(116, '(GMT+09:00) Osaka ', 'Asia/Tokyo'),
(117, '(GMT+09:00) Sapporo ', 'Asia/Tokyo'),
(118, '(GMT+09:00) Seoul ', 'Asia/Seoul'),
(119, '(GMT+09:00) Tokyo ', 'Asia/Tokyo'),
(120, '(GMT+09:30) Adelaide ', 'Australia/Adelaide'),
(121, '(GMT+09:30) Darwin ', 'Australia/Darwin'),
(122, '(GMT+10:00) Brisbane ', 'Australia/Brisbane'),
(123, '(GMT+10:00) Canberra ', 'Australia/Canberra'),
(124, '(GMT+10:00) Guam ', 'Pacific/Guam'),
(125, '(GMT+10:00) Hobart ', 'Australia/Hobart'),
(126, '(GMT+10:00) Melbourne ', 'Australia/Melbourne'),
(127, '(GMT+10:00) Port Moresby ', 'Pacific/Port_Moresby'),
(128, '(GMT+10:00) Sydney ', 'Australia/Sydney'),
(129, '(GMT+10:00) Yakutsk ', 'Asia/Yakutsk'),
(130, '(GMT+11:00) Vladivostok ', 'Asia/Vladivostok'),
(131, '(GMT+12:00) Auckland ', 'Pacific/Auckland'),
(132, '(GMT+12:00) Fiji ', 'Pacific/Fiji'),
(133, '(GMT+12:00) International Date Line West ', 'Pacific/Kwajalein'),
(134, '(GMT+12:00) Kamchatka ', 'Asia/Kamchatka'),
(135, '(GMT+12:00) Magadan ', 'Asia/Magadan'),
(136, '(GMT+12:00) Marshall Is. ', 'Pacific/Fiji'),
(137, '(GMT+12:00) New Caledonia ', 'Asia/Magadan'),
(138, '(GMT+12:00) Solomon Is. ', 'Asia/Magadan'),
(139, '(GMT+12:00) Wellington ', 'Pacific/Auckland'),
(140, '(GMT+13:00) Nuku\\alofa ', 'Pacific/Tongatapu');

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

Hier ist eine, die ein mehrdimensionales Array erstellt, das nach Versatz und schönem Namen sortiert ist:

function timezones() {
    $timezones = [];

    foreach (timezone_identifiers_list() as $timezone) {
        $datetime = new \DateTime('now', new DateTimeZone($timezone));
        $timezones[] = [
            'sort' => str_replace(':', '', $datetime->format('P')),
            'offset' => $datetime->format('P'),
            'name' => str_replace('_', ' ', implode(', ', explode('/', $timezone))),
            'timezone' => $timezone,
        ];
    }

    usort($timezones, function($a, $b) {
        return $a['sort'] - $b['sort'] ?: strcmp($a['name'], $b['name']);
    });

    return $timezones;
}

foreach (timezones() as $timezone) {
    echo '(UTC '.$timezone['offset'].') '.$timezone['name'].'<br>';
}

Echos:

(UTC -11:00) Pacific, Midway
(UTC -11:00) Pacific, Niue
(UTC -11:00) Pacific, Pago Pago
(UTC -10:00) Pacific, Honolulu
(UTC -10:00) Pacific, Johnston
(UTC -10:00) Pacific, Rarotonga
(UTC -10:00) Pacific, Tahiti
(UTC -09:30) Pacific, Marquesas
(UTC -09:00) America, Adak
(UTC -09:00) Pacific, Gambier
(UTC -08:00) America, Anchorage
(UTC -08:00) America, Juneau
...

$timezone = array(
    'Pacific/Midway' => '(GMT-11:00) Midway Island, Samoa',
    'America/Adak' => '(GMT-10:00) Hawaii-Aleutian',
    'Etc/GMT+10' => '(GMT-10:00) Hawaii',
    'Pacific/Marquesas' => '(GMT-09:30) Marquesas Islands',
    'Pacific/Gambier' => '(GMT-09:00) Gambier Islands',
    'America/Anchorage' => '(GMT-09:00) Alaska',
    'America/Ensenada' => '(GMT-08:00) Tijuana, Baja California',
    'Etc/GMT+8' => '(GMT-08:00) Pitcairn Islands',
    'America/Los_Angeles' => '(GMT-08:00) Pacific Time (US & Canada)',
    'America/Denver' => '(GMT-07:00) Mountain Time (US & Canada)',
    'America/Chihuahua' => '(GMT-07:00) Chihuahua, La Paz, Mazatlan',
    'America/Dawson_Creek' => '(GMT-07:00) Arizona',
    'America/Belize' => '(GMT-06:00) Saskatchewan, Central America',
    'America/Cancun' => '(GMT-06:00) Guadalajara, Mexico City, Monterrey',
    'Chile/EasterIsland' => '(GMT-06:00) Easter Island',
    'America/Chicago' => '(GMT-06:00) Central Time (US & Canada)',
    'America/New_York' => '(GMT-05:00) Eastern Time (US & Canada)',
    'America/Havana' => '(GMT-05:00) Cuba',
    'America/Bogota' => '(GMT-05:00) Bogota, Lima, Quito, Rio Branco',
    'America/Caracas' => '(GMT-04:30) Caracas',
    'America/Santiago' => '(GMT-04:00) Santiago',
    'America/La_Paz' => '(GMT-04:00) La Paz',
    'Atlantic/Stanley' => '(GMT-04:00) Faukland Islands',
    'America/Campo_Grande' => '(GMT-04:00) Brazil',
    'America/Goose_Bay' => '(GMT-04:00) Atlantic Time (Goose Bay)',
    'America/Glace_Bay' => '(GMT-04:00) Atlantic Time (Canada)',
    'America/St_Johns' => '(GMT-03:30) Newfoundland',
    'America/Araguaina' => '(GMT-03:00) UTC-3',
    'America/Montevideo' => '(GMT-03:00) Montevideo',
    'America/Miquelon' => '(GMT-03:00) Miquelon, St. Pierre',
    'America/Godthab' => '(GMT-03:00) Greenland',
    'America/Argentina/Buenos_Aires' => '(GMT-03:00) Buenos Aires',
    'America/Sao_Paulo' => '(GMT-03:00) Brasilia',
    'America/Noronha' => '(GMT-02:00) Mid-Atlantic',
    'Atlantic/Cape_Verde' => '(GMT-01:00) Cape Verde Is.',
    'Atlantic/Azores' => '(GMT-01:00) Azores',
    'Europe/Belfast' => '(GMT) Greenwich Mean Time : Belfast',
    'Europe/Dublin' => '(GMT) Greenwich Mean Time : Dublin',
    'Europe/Lisbon' => '(GMT) Greenwich Mean Time : Lisbon',
    'Europe/London' => '(GMT) Greenwich Mean Time : London',
    'Africa/Abidjan' => '(GMT) Monrovia, Reykjavik',
    'Europe/Amsterdam' => '(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna',
    'Europe/Belgrade' => '(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague',
    'Europe/Brussels' => '(GMT+01:00) Brussels, Copenhagen, Madrid, Paris',
    'Africa/Algiers' => '(GMT+01:00) West Central Africa',
    'Africa/Windhoek' => '(GMT+01:00) Windhoek',
    'Asia/Beirut' => '(GMT+02:00) Beirut',
    'Africa/Cairo' => '(GMT+02:00) Cairo',
    'Asia/Gaza' => '(GMT+02:00) Gaza',
    'Africa/Blantyre' => '(GMT+02:00) Harare, Pretoria',
    'Asia/Jerusalem' => '(GMT+02:00) Jerusalem',
    'Europe/Minsk' => '(GMT+02:00) Minsk',
    'Asia/Damascus' => '(GMT+02:00) Syria',
    'Europe/Moscow' => '(GMT+03:00) Moscow, St. Petersburg, Volgograd',
    'Africa/Addis_Ababa' => '(GMT+03:00) Nairobi',
    'Asia/Tehran' => '(GMT+03:30) Tehran',
    'Asia/Dubai' => '(GMT+04:00) Abu Dhabi, Muscat',
    'Asia/Yerevan' => '(GMT+04:00) Yerevan',
    'Asia/Kabul' => '(GMT+04:30) Kabul',
    'Asia/Yekaterinburg' => '(GMT+05:00) Ekaterinburg',
    'Asia/Tashkent' => '(GMT+05:00) Tashkent',
    'Asia/Kolkata' => '(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi',
    'Asia/Katmandu' => '(GMT+05:45) Kathmandu',
    'Asia/Dhaka' => '(GMT+06:00) Astana, Dhaka',
    'Asia/Novosibirsk' => '(GMT+06:00) Novosibirsk',
    'Asia/Rangoon' => '(GMT+06:30) Yangon (Rangoon)',
    'Asia/Bangkok' => '(GMT+07:00) Bangkok, Hanoi, Jakarta',
    'Asia/Krasnoyarsk' => '(GMT+07:00) Krasnoyarsk',
    'Asia/Hong_Kong' => '(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi',
    'Asia/Irkutsk' => '(GMT+08:00) Irkutsk, Ulaan Bataar',
    'Australia/Perth' => '(GMT+08:00) Perth',
    'Australia/Eucla' => '(GMT+08:45) Eucla',
    'Asia/Tokyo' => '(GMT+09:00) Osaka, Sapporo, Tokyo',
    'Asia/Seoul' => '(GMT+09:00) Seoul',
    'Asia/Yakutsk' => '(GMT+09:00) Yakutsk',
    'Australia/Adelaide' => '(GMT+09:30) Adelaide',
    'Australia/Darwin' => '(GMT+09:30) Darwin',
    'Australia/Brisbane' => '(GMT+10:00) Brisbane',
    'Australia/Hobart' => '(GMT+10:00) Hobart',
    'Asia/Vladivostok' => '(GMT+10:00) Vladivostok',
    'Australia/Lord_Howe' => '(GMT+10:30) Lord Howe Island',
    'Etc/GMT-11' => '(GMT+11:00) Solomon Is., New Caledonia',
    'Asia/Magadan' => '(GMT+11:00) Magadan',
    'Pacific/Norfolk' => '(GMT+11:30) Norfolk Island',
    'Asia/Anadyr' => '(GMT+12:00) Anadyr, Kamchatka',
    'Pacific/Auckland' => '(GMT+12:00) Auckland, Wellington',
    'Etc/GMT-12' => '(GMT+12:00) Fiji, Kamchatka, Marshall Is.',
    'Pacific/Chatham' => '(GMT+12:45) Chatham Islands',
    'Pacific/Tongatapu' => '(GMT+13:00) Nukualofa',
    'Pacific/Kiritimati' => '(GMT+14:00) Kiritimati',

date_default_timezone_set($timezone);

Die Verwendung von listAbbreviations () macht keinen Sinn, da für jeden Bereich alle verschiedenen Offsets zurückgegeben werden, die dort historisch verwendet wurden, nicht nur die aktuellen. Die richtige Basisquelle der Liste ist definitiv listIdentifiers ().

Ich würde die Liste nur einmal generieren und speichern, um zu vermeiden, dass sie für jede Anfrage generiert wird. Ich könnte es einmal im Monat aktualisieren.

Außerdem könnte ich alle Zeitzoneninformationen in ein separates js-Skript einfügen und die Auswahlliste selbst auf der Clientseite generieren. Das js-Skript könnte auch zwischengespeichert werden, Zeitzonen ändern sich nicht oft.

Wenn Sie auf der Clientseite Javascript verwenden, können Sie auch die aktuelle Ortszeit ermitteln und somit die Zonen finden, die jetzt dieselbe Zeit haben (die Minuten können abweichen, daher sollte der Vergleich ungefähr sein), und sie oben auf der anzeigen Liste, so dass der Benutzer nicht durch alle 400 Elemente scrollen muss. Sie können auch benachbarte Zonen (+/- 1 Stunde) anzeigen.

Ich weiß, dass dies bereits eine Antwort hat, aber ich sah eine Gelegenheit, eine der Antworten hier zu verbessern. Toland H hat einen sehr guten Code gepostet, der genau das tut, wonach die Frage gefragt hat. Unten finden Sie eine verkürzte und erweiterte Version des Codes von Toland H:

• Die Funktion platziert alles in Options-Tags für Sie. Geben Sie einfach an, was zwischen Ihren ausgewählten Tags zurückgegeben wird.
• Wesentliche Verbesserung: Die Liste wird zuerst nach Kontinenten sortiert und in Optionsgruppen basierend auf Kontinenten organisiert. Macht es sehr benutzerfreundlich für Besucher, die ihre Zeitzone auswählen.

function generate_timezone_list() {
static $allRegions = array(
DateTimeZone::AFRICA,
DateTimeZone::AMERICA,
DateTimeZone::ANTARCTICA,
DateTimeZone::ASIA,
DateTimeZone::ATLANTIC,
DateTimeZone::AUSTRALIA,
DateTimeZone::EUROPE,
DateTimeZone::INDIAN,
DateTimeZone::PACIFIC
);
// Makes it easier to create option groups next
$list = array ('AFRICA','AMERICA','ANTARCTICA','ASIA','ATLANTIC','AUSTRALIA','EUROPE','INDIAN','PACIFIC');
// Make array holding the regions (continents), they are arrays w/ all their cities
$region = array();
foreach ($allRegions as $area){
array_push ($region,DateTimeZone::listIdentifiers( $area ));
}   
$count = count ($region); $i = 0; $holder = '';
// Go through each region one by one, sorting and formatting it's cities
while ($i < $count){
$chunck = $region[$i];
// Create the region (continents) option group
$holder .= '<optgroup label="---------- '.$list[$i].' ----------">';
$timezone_offsets = array();
foreach( $chunck as $timezone ){
$tz = new DateTimeZone($timezone);
$timezone_offsets[$timezone] = $tz->getOffset(new DateTime);
}
asort ($timezone_offsets);
$timezone_list = array();
foreach ($timezone_offsets as $timezone => $offset){
$offset_prefix = $offset < 0 ? '-' : '+';
$offset_formatted = gmdate( 'H:i', abs($offset) );
$pretty_offset = "UTC ${offset_prefix}${offset_formatted}";
$timezone_list[$timezone] = "(${pretty_offset}) $timezone";     
}
// All the formatting is done, finish and move on to next region
foreach ($timezone_list as $key => $val){
$holder .= '<option value="'.$key.'">'.$val.'</option>';
}
$holder .= '</optgroup>';
++$i;
}
return $holder;
}
echo "<select>".generate_timezone_list()."</select>";

Dann müssen Sie nur noch herausfinden, was zwischen Ihren HTML-Auswahl-Tags zurückgegeben wird. Sie erhalten eine Auswahlliste wie folgt:

----- AFRICA -----
(UTC +00:00) Africa/ city name
(UTC +01:00) Africa/ city name
(UTC +02:00) Africa/ city name
(UTC +02:00) Africa/ city name
----- AMERICA -----
(UTC -09:00) America/ city name
(UTC -07:00) America/ city name
(UTC +02:00) America/ city name
(UTC +05:00) America/ city name

Und so weiter...

Diese PHP-Funktion erledigt den Job für Sie und gibt ein Array zurück:

function time_zonelist(){
    $return = array();
    $timezone_identifiers_list = timezone_identifiers_list();
    foreach($timezone_identifiers_list as $timezone_identifier){
        $date_time_zone = new DateTimeZone($timezone_identifier);
        $date_time = new DateTime('now', $date_time_zone);
        $hours = floor($date_time_zone->getOffset($date_time) / 3600);
        $mins = floor(($date_time_zone->getOffset($date_time) - ($hours*3600)) / 60);
        $hours = 'GMT' . ($hours < 0 ? $hours : '+'.$hours);
        $mins = ($mins > 0 ? $mins : '0'.$mins);
        $text = str_replace("_"," ",$timezone_identifier);
        $return[$timezone_identifier] = $text.' ('.$hours.':'.$mins.')';
    }
    return $return;
}

Diese PHP-Funktion gibt ein Array aller vorhandenen Zeitzonen zurück, einschließlich Offset:

Verwenden Sie es zB so:

print_r(time_zonelist());

Ich wollte etwas Einfacheres für meine Nutzer haben, so wie Google es tut.

$timezones = [
    "AF" => [
        "name" => "Afghanistan" 
    ],
    "AL" => [
        "name" => "Albania" 
    ],
    "DZ" => [
        "name" => "Algeria" 
    ],
    "AS" => [
        "name" => "American Samoa" 
    ],
    "AD" => [
        "name" => "Andorra" 
    ],
    "AQ" => [
        "name" => "Antarctica" 
    ],
    "AG" => [
        "name" => "Antigua & Barbuda" 
    ],
    "AR" => [
        "name" => "Argentina" 
    ],
    "AM" => [
        "name" => "Armenia" 
    ],
    "AU" => [
        "name" => "Australia" 
    ],
    "AT" => [
        "name" => "Austria" 
    ],
    "AZ" => [
        "name" => "Azerbaijan" 
    ],
    "BS" => [
        "name" => "Bahamas" 
    ],
    "BD" => [
        "name" => "Bangladesh" 
    ],
    "BB" => [
        "name" => "Barbados" 
    ],
    "BY" => [
        "name" => "Belarus" 
    ],
    "BE" => [
        "name" => "Belgium" 
    ],
    "BZ" => [
        "name" => "Belize" 
    ],
    "BM" => [
        "name" => "Bermuda" 
    ],
    "BT" => [
        "name" => "Bhutan" 
    ],
    "BO" => [
        "name" => "Bolivia" 
    ],
    "BA" => [
        "name" => "Bosnia & Herzegovina" 
    ],
    "BR" => [
        "name" => "Brazil" 
    ],
    "IO" => [
        "name" => "British Indian Ocean Territory" 
    ],
    "BN" => [
        "name" => "Brunei" 
    ],
    "BG" => [
        "name" => "Bulgaria" 
    ],
    "CA" => [
        "name" => "Canada" 
    ],
    "CV" => [
        "name" => "Cape Verde" 
    ],
    "KY" => [
        "name" => "Cayman Islands" 
    ],
    "TD" => [
        "name" => "Chad" 
    ],
    "CL" => [
        "name" => "Chile" 
    ],
    "CN" => [
        "name" => "China" 
    ],
    "CX" => [
        "name" => "Christmas Island" 
    ],
    "CC" => [
        "name" => "Cocos (Keeling) Islands" 
    ],
    "CO" => [
        "name" => "Colombia" 
    ],
    "CK" => [
        "name" => "Cook Islands" 
    ],
    "CR" => [
        "name" => "Costa Rica" 
    ],
    "CI" => [
        "name" => "Côte d’Ivoire" 
    ],
    "HR" => [
        "name" => "Croatia" 
    ],
    "CU" => [
        "name" => "Cuba" 
    ],
    "CW" => [
        "name" => "Curaçao" 
    ],
    "CY" => [
        "name" => "Cyprus" 
    ],
    "CZ" => [
        "name" => "Czech Republic" 
    ],
    "DK" => [
        "name" => "Denmark" 
    ],
    "DO" => [
        "name" => "Dominican Republic" 
    ],
    "EC" => [
        "name" => "Ecuador" 
    ],
    "EG" => [
        "name" => "Egypt" 
    ],
    "SV" => [
        "name" => "El Salvador" 
    ],
    "EE" => [
        "name" => "Estonia" 
    ],
    "FK" => [
        "name" => "Falkland Islands (Islas Malvinas)" 
    ],
    "FO" => [
        "name" => "Faroe Islands" 
    ],
    "FJ" => [
        "name" => "Fiji" 
    ],
    "FI" => [
        "name" => "Finland" 
    ],
    "FR" => [
        "name" => "France" 
    ],
    "GF" => [
        "name" => "French Guiana" 
    ],
    "PF" => [
        "name" => "French Polynesia" 
    ],
    "TF" => [
        "name" => "French Southern Territories" 
    ],
    "GE" => [
        "name" => "Georgia" 
    ],
    "DE" => [
        "name" => "Germany" 
    ],
    "GH" => [
        "name" => "Ghana" 
    ],
    "GI" => [
        "name" => "Gibraltar" 
    ],
    "GR" => [
        "name" => "Greece" 
    ],
    "GL" => [
        "name" => "Greenland" 
    ],
    "GU" => [
        "name" => "Guam" 
    ],
    "GT" => [
        "name" => "Guatemala" 
    ],
    "GW" => [
        "name" => "Guinea-Bissau" 
    ],
    "GY" => [
        "name" => "Guyana" 
    ],
    "HT" => [
        "name" => "Haiti" 
    ],
    "HN" => [
        "name" => "Honduras" 
    ],
    "HK" => [
        "name" => "Hong Kong" 
    ],
    "HU" => [
        "name" => "Hungary" 
    ],
    "IS" => [
        "name" => "Iceland" 
    ],
    "IN" => [
        "name" => "India" 
    ],
    "ID" => [
        "name" => "Indonesia" 
    ],
    "IR" => [
        "name" => "Iran" 
    ],
    "IQ" => [
        "name" => "Iraq" 
    ],
    "IE" => [
        "name" => "Ireland" 
    ],
    "IL" => [
        "name" => "Israel" 
    ],
    "IT" => [
        "name" => "Italy" 
    ],
    "JM" => [
        "name" => "Jamaica" 
    ],
    "JP" => [
        "name" => "Japan" 
    ],
    "JO" => [
        "name" => "Jordan" 
    ],
    "KZ" => [
        "name" => "Kazakhstan" 
    ],
    "KE" => [
        "name" => "Kenya" 
    ],
    "KI" => [
        "name" => "Kiribati" 
    ],
    "KG" => [
        "name" => "Kyrgyzstan" 
    ],
    "LV" => [
        "name" => "Latvia" 
    ],
    "LB" => [
        "name" => "Lebanon" 
    ],
    "LR" => [
        "name" => "Liberia" 
    ],
    "LY" => [
        "name" => "Libya" 
    ],
    "LT" => [
        "name" => "Lithuania" 
    ],
    "LU" => [
        "name" => "Luxembourg" 
    ],
    "MO" => [
        "name" => "Macau" 
    ],
    "MK" => [
        "name" => "Macedonia (FYROM)" 
    ],
    "MY" => [
        "name" => "Malaysia" 
    ],
    "MV" => [
        "name" => "Maldives" 
    ],
    "MT" => [
        "name" => "Malta" 
    ],
    "MH" => [
        "name" => "Marshall Islands" 
    ],
    "MQ" => [
        "name" => "Martinique" 
    ],
    "MU" => [
        "name" => "Mauritius" 
    ],
    "MX" => [
        "name" => "Mexico" 
    ],
    "FM" => [
        "name" => "Micronesia" 
    ],
    "MD" => [
        "name" => "Moldova" 
    ],
    "MC" => [
        "name" => "Monaco" 
    ],
    "MN" => [
        "name" => "Mongolia" 
    ],
    "MA" => [
        "name" => "Morocco" 
    ],
    "MZ" => [
        "name" => "Mozambique" 
    ],
    "MM" => [
        "name" => "Myanmar (Burma)" 
    ],
    "NA" => [
        "name" => "Namibia" 
    ],
    "NR" => [
        "name" => "Nauru" 
    ],
    "NP" => [
        "name" => "Nepal" 
    ],
    "NL" => [
        "name" => "Netherlands" 
    ],
    "NC" => [
        "name" => "New Caledonia" 
    ],
    "NZ" => [
        "name" => "New Zealand" 
    ],
    "NI" => [
        "name" => "Nicaragua" 
    ],
    "NG" => [
        "name" => "Nigeria" 
    ],
    "NU" => [
        "name" => "Niue" 
    ],
    "NF" => [
        "name" => "Norfolk Island" 
    ],
    "KP" => [
        "name" => "North Korea" 
    ],
    "MP" => [
        "name" => "Northern Mariana Islands" 
    ],
    "NO" => [
        "name" => "Norway" 
    ],
    "PK" => [
        "name" => "Pakistan" 
    ],
    "PW" => [
        "name" => "Palau" 
    ],
    "PS" => [
        "name" => "Palestine" 
    ],
    "PA" => [
        "name" => "Panama" 
    ],
    "PG" => [
        "name" => "Papua New Guinea" 
    ],
    "PY" => [
        "name" => "Paraguay" 
    ],
    "PE" => [
        "name" => "Peru" 
    ],
    "PH" => [
        "name" => "Philippines" 
    ],
    "PN" => [
        "name" => "Pitcairn Islands" 
    ],
    "PL" => [
        "name" => "Poland" 
    ],
    "PT" => [
        "name" => "Portugal" 
    ],
    "PR" => [
        "name" => "Puerto Rico" 
    ],
    "QA" => [
        "name" => "Qatar" 
    ],
    "RE" => [
        "name" => "Réunion" 
    ],
    "RO" => [
        "name" => "Romania" 
    ],
    "RU" => [
        "name" => "Russia" 
    ],
    "WS" => [
        "name" => "Samoa" 
    ],
    "SM" => [
        "name" => "San Marino" 
    ],
    "SA" => [
        "name" => "Saudi Arabia" 
    ],
    "RS" => [
        "name" => "Serbia" 
    ],
    "SC" => [
        "name" => "Seychelles" 
    ],
    "SG" => [
        "name" => "Singapore" 
    ],
    "SK" => [
        "name" => "Slovakia" 
    ],
    "SI" => [
        "name" => "Slovenia" 
    ],
    "SB" => [
        "name" => "Solomon Islands" 
    ],
    "ZA" => [
        "name" => "South Africa" 
    ],
    "GS" => [
        "name" => "South Georgia & South Sandwich Islands" 
    ],
    "KR" => [
        "name" => "South Korea" 
    ],
    "ES" => [
        "name" => "Spain" 
    ],
    "LK" => [
        "name" => "Sri Lanka" 
    ],
    "PM" => [
        "name" => "St. Pierre & Miquelon" 
    ],
    "SD" => [
        "name" => "Sudan" 
    ],
    "SR" => [
        "name" => "Suriname" 
    ],
    "SJ" => [
        "name" => "Svalbard & Jan Mayen" 
    ],
    "SE" => [
        "name" => "Sweden" 
    ],
    "CH" => [
        "name" => "Switzerland" 
    ],
    "SY" => [
        "name" => "Syria" 
    ],
    "TW" => [
        "name" => "Taiwan" 
    ],
    "TJ" => [
        "name" => "Tajikistan" 
    ],
    "TH" => [
        "name" => "Thailand" 
    ],
    "TL" => [
        "name" => "Timor-Leste" 
    ],
    "TK" => [
        "name" => "Tokelau" 
    ],
    "TO" => [
        "name" => "Tonga" 
    ],
    "TT" => [
        "name" => "Trinidad & Tobago" 
    ],
    "TN" => [
        "name" => "Tunisia" 
    ],
    "TR" => [
        "name" => "Turkey" 
    ],
    "TM" => [
        "name" => "Turkmenistan" 
    ],
    "TC" => [
        "name" => "Turks & Caicos Islands" 
    ],
    "TV" => [
        "name" => "Tuvalu" 
    ],
    "UM" => [
        "name" => "U.S. Outlying Islands" 
    ],
    "UA" => [
        "name" => "Ukraine" 
    ],
    "AE" => [
        "name" => "United Arab Emirates" 
    ],
    "GB" => [
        "name" => "United Kingdom" 
    ],
    "US" => [
        "name" => "United States" 
    ],
    "UY" => [
        "name" => "Uruguay" 
    ],
    "UZ" => [
        "name" => "Uzbekistan" 
    ],
    "VU" => [
        "name" => "Vanuatu" 
    ],
    "VA" => [
        "name" => "Vatican City" 
    ],
    "VE" => [
        "name" => "Venezuela" 
    ],
    "VN" => [
        "name" => "Vietnam" 
    ],
    "WF" => [
        "name" => "Wallis & Futuna" 
    ],
    "EH" => [
        "name" => "Western Sahara" 
    ],
];

// taken from Toland Hon's Answer
function prettyOffset($offset) {
    $offset_prefix = $offset < 0 ? '-' : '+';
    $offset_formatted = gmdate( 'H:i', abs($offset) );

    $pretty_offset = "UTC${offset_prefix}${offset_formatted}";

    return $pretty_offset;
}

foreach ($timezones as $k => $v) {
    $tz = DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, $k);

    foreach ($tz as $value) {
        $t = new DateTimeZone($value);
        $offset = (new DateTime("now", $t))->getOffset();
        $timezones[$k]['timezones'][$value] = prettyOffset($offset);
    }   
}