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I'm making a shopping cart.
Shopping Cart Page cart.php

 Define (' Accese ', 1);
Require ('.. /init.php ');

$_get[' gid '] = (int) $_get[' gid ');
$_get[' num '] = (int) $_get[' num '];

$goods = new Goodsmodel ();
$goods->db ();
$cart = Cart::getcart ();

Switch ($_get[' act ']) {
Add Item
Case ' buy ': {
$result = $goods->select_goods ("g_id = $_get[gid] and g_sale=1 and g_del=0");
$g = $goods->db->fetch_array ($result);
Have this product
if (!empty ($g)) {//Determine if the product exists
if ($g [' G_no '] < $_get[' num ') {//Determine inventory
$type = ' ERROR ';
$msg = ' Put to cart add failed (may be out of stock or admin pocketed) ';
Include (ROOT. ' view/home/tip.html ');
Exit
}
Commodity presence
$cart->additem ("$g [g_id]", "$g [G_name]", "$g [G_price]", "$_get[num]"); ----------------------This line error
} else {
$type = ' ERROR ';
$msg = ' Put to cart add failed (may be down, deleted or admin pocketed) ';
Include (ROOT. ' view/home/tip.html ');
Exit
}
Break
}

}

$title = ' Shopping cart-mall system ';
$path = ' shopping cart ';
Include (ROOT. ' view/home/cart.html ');
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