PHP tutorial: Combining cookies and arrays to implement a shopping cart

I found that the results obtained by many PHP functions are given by arrays. The most commonly used one is mysql_fetch_array(),
including the obtained string information to generate an array, and then the array is decomposed into a string using the functions explode(); implode() ;

I have never written an implementation like a shopping cart before. I feel that I am a stupid type. I wrote it intermittently for a week and figured out (I am allowed to be arrogant as a novice) the shopping cart processing program.
And because I have never entered the class, I still focus on the process.

The essence of the method I use is: store the cookie in the array, add, delete, and modify the array. Each set of records in the array is information about a product (number, price, etc.)



Solution The idea of ​​the shopping cart is to use cookies to record a two-dimensional array. One dimension represents each product, and two dimensions include the product ID, the quantity of the product, etc. You can add it by yourself. Anyway, it is two-dimensional. You can add as many product attributes as you want.

The operations on items in the shopping cart generally include the following: adding items, modifying the quantity of items, deleting items, and clearing the shopping cart.
These operations are all for cookies. Each time, the array in the cookie is taken out, added, modified, deleted, and then recorded in the cookie. As for clearing the shopping cart, it's even simpler. Just set the cookie with the same name to empty.

The following is the specific operation function I wrote

//Add to cart
function addcart($goods_id,$goods_num){

$cur_cart_array = unserialize(stripslashes($_COOKIE['shop_cart_info']));
if($cur_cart_array==""){

$ cart_info[0][] = $goods_id;
$cart_info[0][] = $goods_num;

setcookie("shop_cart_info",serialize($cart_info));

}elseif($cur_cart_array<>"") {

//Return the largest array key name in reverse order
$ar_keys = array_keys($cur_cart_array);
rsort($ar_keys);
$max_array_keyid = $ar_keys[0]+1;

//Traverse the current shopping cart Array
//Traverse the 0 value of each product information array. If the key value is 0 and the item number is the same, the same item exists in the shopping cart
foreach($cur_cart_array as $goods_current_cart){
foreach($goods_current_cart as $key=>$ goods_current_id){
if($key == 0 and $goods_current_id == $goods_id){
echo "";
exit();
}
}

$cur_cart_array[$max_array_keyid][] = $goods_id;
$ cur_cart_array[$max_array_keyid ][] = $goods_num;

setcookie("shop_cart_info",serialize($cur_cart_array));

}

}

//Delete from shopping cart
function delcart($goods_array_id){

$cur_goods_array = unserialize (stripslashes($_COOKIE['shop_cart_info']));

//Delete the position of the product in the array
unset($cur_goods_array[$goods_array_id]);
setcookie("shop_cart_info",serialize($cur_goods_array));

}

//Modify the quantity of items in the shopping cart
function update_cart($up_id,$up_num,$goods_ids){

//Clear the cookie first so that it can be reset, and pass the three array parameters 1 the identifier of the array 2 the product Quantity array 3 product number array
//If the cookie is not cleared, products with a quantity of zero cannot be processed
setcookie("shop_cart_info","");
foreach($up_id as $song){

//Return the current array first unit; then move the pointer down one position
$goods_nums = current($up_num);
$goods_id = current($goods_ids);
next($up_num);
next($goods_ids);

//When the goods When the quantity is empty, unregister the array value here and use the continue 2 statement to avoid the following operations, and continue with the foreach loop
while($goods_nums == 0){
unset($song);
continue 2;
}

$cur_goods_array[$song][0] = $goods_id;
$cur_goods_array[$song][1] = $goods_nums;

}

setcookie("shop_cart_info",serialize($cur_goods_array));

}

For the subsequent order formation, you need to put it into storage according to your own needs, whether there are points, cash rewards, etc.