class CdProduct
{
	public $playLength;
	public $title;
	public $producerMainName;
	public $producerFirstName;
	public $price;
	public function __construct(
		string $title,
		string $firstName,
		string $mainName,
		float  $price,
		int    $playLength
	){
		$this->title             = $title;
		$this->producerFirstName = $firstName;
		$this->producerMainName  = $mainName;
		$this->price             = $price;
		$this->playLength        = $playLength;
	}
	public function getPlayLength(): int
	{
		return $this->playLength;
	}
	public function getSummaryLine(): string
	{
        	$base = "{$this->title} ( {$this->producerMainName}, ";
        	$base .= "{$this->producerFirstName} )";
               	$base .= ": playing time - {$this->playLengh}";
        	return $base;
	}
	public function getProducer(): string
	{
		return $this->producerFirstName . " "
			. $this->producerMainName;
	}
}