YandexJson::encode

static function encode($data, $options = null)
{
	// php 5.4.0+
	if(defined('JSON_UNESCAPED_UNICODE'))
	{
		return parent::encode($data, JSON_UNESCAPED_UNICODE);
	}
	else
	{
		return static::_encode(static::convertData($data));
	}
}