Get list of timezones translated to given language in PHP

tzlist.php

<?php

/**
 * Get list of timezones translated in given language
 * 
 * Requires PHP Intl extension to be present & active in your PHP setup
 * 
 * @param string $langcode - an ISO 639-1 language code
 * @return array
 */

function getTimezoneList($langcode = 'en') {
    $regions = array(
        'AFRICA', 'AMERICA', 'ASIA', 
        'ATLANTIC', 'AUSTRALIA',
        'EUROPE', 'INDIAN', 'PACIFIC'
    );

    /* Filter timezones by region (we don't include Antarctica & UTC here) */
    $regcode = array_reduce($regions, function($c, $region) {
        if ($rv = @constant("DateTimeZone::$region")) {
            $c |= $rv;
        }

        return $c;
    }, 0);
    
    /* Get list of timezone IDs (in form of "Region/City") */
    $idlist = DateTimeZone::listIdentifiers($regcode);

    /* Create an array with zone names in selected language as keys
     * and timezone IDs as values. This way we filler out locations
     * that have same timezone names.
     */
    $buf = array();
    foreach ($idlist as $id) {
        $itz = IntlTimeZone::createTimeZone($id);
        if (!$itz) {
            continue;
        }
        $k = $itz->getDisplayName(false, 2, $langcode);
        $buf[$k] = $id;
    }

    $buf = array_flip($buf);

    /* Build a fancy timezone information array */
    $tz = array();
    foreach ($buf as $id => $v) {
        $itz = IntlTimeZone::createTimeZone($id);
		
        $tz[] = array(
            // Timezone ID (e.g. "Europe/Zurich")
            'id' => $id,
            // Timezone abbreviated name (e.g. "GMT+1")
            'abbr' => $itz->getDisplayName(false, 1, $langcode),
            // Timezone name (e.g. "Central European Standard Time")
            'name' => ucfirst($v),
            // Timezone's offset from UTC, in milliseconds (e.g. 3600000)
            'ofs' => $itz->getRawOffset()
        );
    }

    /* Sort return array by UTC offset */
    usort($tz, function($a, $b) {
        return $a['ofs'] - $b['ofs'];
    });

    return $tz;
}