93 lines
2.6 KiB
PHP
93 lines
2.6 KiB
PHP
<?php
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/**
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* Generates a list of available timezone continents and cities.
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*
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* Two distinct array based on available timezones
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* and the one selected in the settings:
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* - (0) continents:
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* + list of available continents
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* + special key 'selected' containing the value of the selected timezone's continent
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* - (1) cities:
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* + list of available cities associated with their continent
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* + special key 'selected' containing the value of the selected timezone's city (without the continent)
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*
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* Example:
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* [
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* [
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* 'America',
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* 'Europe',
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* 'selected' => 'Europe',
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* ],
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* [
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* ['continent' => 'America', 'city' => 'Toronto'],
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* ['continent' => 'Europe', 'city' => 'Paris'],
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* 'selected' => 'Paris',
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* ],
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* ];
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*
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* Notes:
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* - 'UTC/UTC' is mapped to 'UTC' to form a valid option
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* - a few timezone cities includes the country/state, such as Argentina/Buenos_Aires
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* - these arrays are designed to build timezone selects in template files with any HTML structure
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*
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* @param array $installedTimeZones List of installed timezones as string
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* @param string $preselectedTimezone preselected timezone (optional)
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*
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* @return array[] continents and cities
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**/
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function generateTimeZoneData($installedTimeZones, $preselectedTimezone = '')
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{
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if ($preselectedTimezone == 'UTC') {
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$pcity = $pcontinent = 'UTC';
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} else {
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// Try to split the provided timezone
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$spos = strpos($preselectedTimezone, '/');
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$pcontinent = substr($preselectedTimezone, 0, $spos);
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$pcity = substr($preselectedTimezone, $spos + 1);
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}
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$continents = [];
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$cities = [];
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foreach ($installedTimeZones as $tz) {
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if ($tz == 'UTC') {
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$tz = 'UTC/UTC';
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}
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$spos = strpos($tz, '/');
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// Ignore invalid timezones
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if ($spos === false) {
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continue;
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}
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$continent = substr($tz, 0, $spos);
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$city = substr($tz, $spos + 1);
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$cities[] = ['continent' => $continent, 'city' => $city];
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$continents[$continent] = true;
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}
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$continents = array_keys($continents);
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$continents['selected'] = $pcontinent;
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$cities['selected'] = $pcity;
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return [$continents, $cities];
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}
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/**
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* Tells if a continent/city pair form a valid timezone
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*
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* Note: 'UTC/UTC' is mapped to 'UTC'
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*
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* @param string $continent the timezone continent
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* @param string $city the timezone city
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*
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* @return bool whether continent/city is a valid timezone
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*/
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function isTimeZoneValid($continent, $city)
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{
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return in_array(
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$continent . '/' . $city,
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timezone_identifiers_list()
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);
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}
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