please help to understand this php code

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PHP

public $config = array();
private $items = array();
private $names = array();
private $prices = array();
private $qtys = array();
private $urls = array();
private $subtotal = 0;
private $itemCount = 0;
can any body please explain what the meaning of above code. in the first line its says class Jcart in my other index.php file, the thing is i am learning php and so i downloaded this code and try to understand it but i got stuck in these lines. and i dont understand why he wrote it that way, please explain