/**
* Returns the stub ICU data
*
* @param string $locale The locale code
* @param string $cacheVariable The name of a static attribute to cache the data to
* @param string $stubDataDir The stub data directory name
*
* @return array
*
* @throws \InvalidArgumentException When the locale is different than 'en'
*/
private static function getStubData($locale, $cacheVariable, $stubDataDir)
{
$dataDirectory = Locale::getIcuDataDirectory();
if ('en' !== $locale) {
throw new \InvalidArgumentException(sprintf('Only the \'en\' locale is supported. %s', NotImplementedException::INTL_INSTALL_MESSAGE));
}
if (empty(self::${$cacheVariable})) {
self::${$cacheVariable} = (include $dataDirectory . '/stub/' . $stubDataDir . '/en.php');
}
return self::${$cacheVariable};
}
