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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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