CountryProvider::fetchMetadata

private function fetchMetadata(): array
{
	if (file_exists($this->metadataFilename) && is_file($this->metadataFilename))
	{
		$allData = CUtil::JsObjectToPhp(file_get_contents($this->metadataFilename));
		$metadata = $allData['metadata'] ?? [];

		return array_column($metadata, 'countryCode', 'id');
	}

	return [];
}