Multiple::toString

public function toString($modifier = '')
{
	$options = $this->getOptions($modifier);

	$modifier = preg_replace('#mseparator=d#', '', $modifier);
	$modifier = preg_replace('#mfirst=[y,n]#', '', $modifier);
	$modifier = preg_replace('#[,+]#', ',', $modifier);
	$modifier = trim($modifier, ',');
	$separator = $this->getSeparatorByCode($options['mseparator']);
	$isFirst = $options['mfirst'];

	if(is_array($this->value) || $this->value instanceof Traversable)
	{
		$values = [];
		foreach($this->value as $value)
		{
			if($value instanceof Value)
			{
				$values[] = $value->toString($modifier);
			}
			elseif(is_array($value) || is_object($value))
			{
				continue;
			}
			elseif(!empty($value) && $value !== 0)
			{
				$values[] = $value;
			}
			if($isFirst && count($values) == 1)
			{
				break;
			}
		}

		return implode($separator, $values);
	}
	elseif($this->value instanceof Value)
	{
		return $this->value->toString($modifier);
	}
	elseif(is_object($this->value) && method_exists($this->value, '__toString'))
	{
		return $this->value->__toString();
	}
	elseif(!is_object($this->value))
	{
		return $this->value;
	}

	return '';
}