php5类的类型提示

php面相对象中参数变量可以包含任何基本类型的数据,参数默认情况下也可以包含任何类型的对象,这中灵活的运用在在方法定义中可能会出现问题,但是php引入类的类型提示

class productwrite
{
	public function write(product $product) // 规定必须是product的实例
	{
		$str = "{$product->title}".
				$product->getproducter().
				"({$product->price})\n";
		print $str;
	}
}
class product
{
	public $title;
	public $b;
	public $c;
	public $price;
	function __construct($title,$b,$c,$price)
	{
		$this->title = $title;
		$this->b = $b;
		$this->c = $c;
		$this->price = $price;
	}
	function getproducter()
	{
		echo $this->b."&nbsp";
		echo $this->c;
	}
}

$product = new product("my antonia","willa","cather","5.99");
$write = new productwrite();
$write->write($product); //把product的实例传入 productwrit的write方法中

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