现有一手推车类程序(cart.inc)其中包含有一添加物品的方法(add_item),下面哪个选项可以正确使用方法add_item。()
<?php
include(“cart.inc”);
$cart=new Cart();
$cart->add_item(“10”,1);
?>
<?php
require(“cart.inc”);
$cart=new Cart();
$cart->add_item(“10”,1);
?>
<?php
require(“cart.inc”);
$cart=new Cart;
$cart->add_item(“10”,1);
?>
<?php
require(“cart.inc”);
$cart=new Cart
$cart->add_item(“10”,1)
?>