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<?php
declare(strict_types=1);
namespace Sabre\VObject\TimezoneGuesser;
use DateTimeZone;
use Exception;
/**
* Some clients add 'X-LIC-LOCATION' with the olson name.
*/
class FindFromTimezoneIdentifier implements TimezoneFinder
{
public function find(string $tzid, bool $failIfUncertain = false): ?DateTimeZone
{
// First we will just see if the tzid is a support timezone identifier.
//
// The only exception is if the timezone starts with (. This is to
// handle cases where certain microsoft products generate timezone
// identifiers that for instance look like:
//
// (GMT+01.00) Sarajevo/Warsaw/Zagreb
//
// Since PHP 5.5.10, the first bit will be used as the timezone and
// this method will return just GMT+01:00. This is wrong, because it
// doesn't take DST into account
if (!isset($tzid[0])) {
return null;
}
if ('(' === $tzid[0]) {
return null;
}
// PHP has a bug that logs PHP warnings even it shouldn't:
// https://bugs.php.net/bug.php?id=67881
//
// That's why we're checking if we'll be able to successfully instantiate
// \DateTimeZone() before doing so. Otherwise we could simply instantiate
// and catch the exception.
$tzIdentifiers = DateTimeZone::listIdentifiers();
try {
if (
(in_array($tzid, $tzIdentifiers)) ||
(preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) ||
(in_array($tzid, $this->getIdentifiersBC()))
) {
return new DateTimeZone($tzid);
}
} catch (Exception $e) {
}
return null;
}
/**
* This method returns an array of timezone identifiers, that are supported
* by DateTimeZone(), but not returned by DateTimeZone::listIdentifiers().
*
* We're not using DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC) because:
* - It's not supported by some PHP versions as well as HHVM.
* - It also returns identifiers, that are invalid values for new DateTimeZone() on some PHP versions.
* (See timezonedata/php-bc.php and timezonedata php-workaround.php)
*
* @return array
*/
private function getIdentifiersBC()
{
return include __DIR__.'/../timezonedata/php-bc.php';
}
}
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