Alexis Saettler
127 lines
3.5 KiB
PHP
127 lines
3.5 KiB
PHP
<?php
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namespace App\Helpers;
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use DateTimeZone;
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class TimezoneHelper
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{
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/**
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* Get a list of all timezones.
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*
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* @return array
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*/
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public static function getListOfTimezones(): array
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{
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$list = [];
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$timezones = DateTimeZone::listIdentifiers();
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if ($timezones !== false) {
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foreach ($timezones as $timezone) {
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[$tz, $name] = self::formatTimezone($timezone);
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array_push($list, [
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'id' => $tz,
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'timezone' => $timezone,
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'name' => $name,
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]);
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}
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}
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$collect = collect($list)
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->groupBy('id')
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->sortKeys();
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$result = [];
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foreach ($collect as $item) {
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$values = $item->sortByCollator(function ($value) {
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return $value['name'];
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});
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foreach ($values as $val) {
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array_push($result, $val);
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}
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}
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return $result;
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}
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/**
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* Format a timezone to be displayed (english only).
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*
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* @param string $timezone
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* @return array int value of the offset, string formatted timezone
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*/
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private static function formatTimezone($timezone): array
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{
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$dtimezone = new DateTimeZone($timezone);
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$time = now($timezone);
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$offset = $time->format('P');
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$loc = $dtimezone->getLocation();
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if ($timezone == 'UTC') {
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$formatted = '(UTC) Universal Time Coordinated';
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} else {
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$name = $time->tzName;
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$i = strpos($name, '/');
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if ($i > 0) {
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$name = substr($name, $i + 1);
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}
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$name = str_replace(['St_', '/', '_'], ['St. ', ', ', ' '], $name);
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if (empty($loc['comments'])) {
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$formatted = '(UTC '.$offset.') '.$name;
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} else {
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$formatted = '(UTC '.$offset.') '.$loc['comments'].' ('.$name.')';
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}
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}
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$tz = str_replace(':', '', $offset);
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$tz = intval($tz);
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return [$tz, $formatted];
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}
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/**
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* Equivalent timezone to convert deprecated timezone.
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*
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* @var array<string>
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*
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* @see https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
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*/
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protected static $equivalentTimezone = [
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'Australia/Canberra' => 'Australia/Sydney',
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'Asia/Calcutta' => 'Asia/Kolkata',
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'Asia/Chongqing' => 'Asia/Shanghai',
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'Asia/Katmandu' => 'Asia/Kathmandu',
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'Asia/Rangoon' => 'Asia/Yangon',
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'Asia/Ulan_Bator' => 'Asia/Ulaanbaatar',
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'Canada/Atlantic' => 'America/Halifax',
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'Canada/Newfoundland' => 'America/St_Johns',
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'Canada/Saskatchewan' => 'America/Regina',
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'Etc/Greenwich' => 'UTC', // This is not an equivalent, but it the same zone
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'Pacific/Samoa' => 'Pacific/Pago_Pago',
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'US/Alaska' => 'America/Anchorage',
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'US/Arizona' => 'America/Phoenix',
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'US/Central' => 'America/Chicago',
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'US/East-Indiana' => 'America/Indiana/Indianapolis',
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'US/Eastern' => 'America/New_York',
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'US/Mountain' => 'America/Denver',
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];
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/**
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* Adjust a timezone with equivalent name (remove deprecated).
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*
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* @param string $timezone
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* @return string
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*/
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public static function adjustEquivalentTimezone($timezone): string
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{
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if (array_key_exists($timezone, self::$equivalentTimezone)) {
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return self::$equivalentTimezone[$timezone];
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}
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return $timezone;
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}
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}
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