class Cart{
public function Cart(){
echo "正在调用Cart()
";
}
public function doSomething(){
echo "正在调用doSomethimg()
";
}
}
class Named_Cart extends Cart{
function Named_Cart(){
echo "正在调用Named_Cart()
";
}
function doSomething(){
echo "正在调用Named_Cart::doSomething()
";
}
}
$myCart=new Cart();
$myCart->doSomething();
$myNamed_Cart=new Named_Cart();
$myNamed_Cart->doSomething();
?>
在方法覆盖时，务必要使用与原始方法相同的约定，包括参数要一致。属性覆盖也遵循相同的约定。
在覆盖基类的方法后，使用parent关键字仍然可以调用基类的doSomething()方法，而非当前类中的doSomething()方法。
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