PHP 学习1.3

1.展示类的继承和静态的方法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>定义和调用函数</title>
</head>

<body>
<?
class Cart{
var $items;
function Cart(){
      $this->Say();
   }
function addItem($product,$num){
   $this->items[$product]+=$num;
   }
function reomveItem($product,$num){
      if($this->items[$product]>$num){
       $this->items[$product]-=$num;
       return true;
       }elseif($this->items[$product]==$num){
           unset($this->items[$product]);
           return true;
       }
        else{
          return false;
       }
   }
   function ShowCart(){
       foreach($this->items as $k=>$v){
       echo "<br/> ".$k."=".$v;
      }
    }
   function Say(){
       echo "<br/> I'm Cart";
    }
   static   function SayHello(){
        echo "<br/> Hello World!";
        }
   }
class AutoCart extends Cart
{
    function AutoCart(){
        $this->addItem("product1",1);
        $this->Say();
        }
    function ConstructCart($p="11",$n=2){
    $this->addItem($p,$n);
        }
    function Say(){
       echo "<br/> I'm AutoCart";
    }
}
Cart::SayHello();
$cart = new AutoCart();
$cart->ShowCart();
$cart2=new Cart();
$cart2->addItem("12",2);
$cart2->ShowCart();

?>
</body>
</html>