'.$city.''; } } $continents_html = ''; $continents = array_keys($continents); foreach ($continents as $continent) { $continents_html .= ''; } // Timezone selection form $timezone_form = 'Continent:'; $timezone_form .= ''; $timezone_form .= $continents_html.''; $timezone_form .= '    City:'; $timezone_form .= ''.$cities[$pcontinent].'
'; // Javascript handler - updates the city list when the user selects a continent $timezone_js = ''; return array($timezone_form, $timezone_js); } /** * Tells if a continent/city pair form a valid timezone * * Note: 'UTC/UTC' is mapped to 'UTC' * * @param string $continent the timezone continent * @param string $city the timezone city * * @return whether continent/city is a valid timezone */ function isTimeZoneValid($continent, $city) { if ($continent == 'UTC' && $city == 'UTC') { return true; } return in_array( $continent.'/'.$city, timezone_identifiers_list() ); } ?>