/**
* Returns the known country/region codes as an array.
*
* @return CArrayObject The known country/region codes of type `CUStringObject`.
*/
public static function knownCountryCodes()
{
return oop_a(CMap::keys(DULocale::$CountryCodeToInfo));
}
/**
* Extracts and returns the keys from a map, as an array.
*
* @return CArrayObject The map's keys.
*/
public function keys()
{
return CArrayObject::fromSplArray(CMap::keys($this->m_map));
}
public function testKeys()
{
$map = ["one" => "a", "two" => "b", "three" => "c"];
$keys = CMap::keys($map);
$this->assertTrue(CArray::equals($keys, CArray::fromElements("one", "two", "three")));
}