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/**
 * Преобразует SimpleXMLElement в array
 * @param SimpleXMLElement $xml
 * @return array
 */
private static function xmlToArray($xml) {
	$xml = (array) $xml;

	if(empty($xml)) {
		return null;
	}

	foreach ($xml as $key=>$val) {
		if ($val instanceof SimpleXMLElement) {
			$xml[$key] = self::xmlToArray($val);
		} elseif (empty($val)) {
			$xml[$key] = null;
		}
	}

	return $xml;
}