How to use cookies to implement a shopping cart in PHP, cookies shopping cart_PHP tutorial

/**
*Shopping cart cookies are saved with a storage period of 1 day. Note: The browser must support cookies to use
​*/
class cartapi {
private $cartarray = array(); // Two-dimensional array to store shopping cart
private $cartcount; // Count the number of shopping carts
public $expires = 86400; // Cookie expiration time, if it is 0, it will not be saved locally. The unit is seconds
/**
* Constructor initialization operation If $id is not empty, add it directly to the shopping cart
*
​*/
public function __construct($id = "",$name = "",$price1 = "",$price2 = "",$price3 = "",$count = "",$image = "",$expires = 86400 ) {
if ($id != "" && is_numeric($id)) {
$this->expires = $expires;
$this->addcart($id,$name,$price1,$price2,$price3,$count,$image);
}
}
/**
* Add items to cart
*
* @param int $id item number
* @param string $name product name
* @param decimal $price1 Product price
* @param decimal $price2 Product price
* @param decimal $price3 Product price
* @param int $count item quantity
* @param string $image product image
* @return If the product exists, add 1 to the original quantity and return false
​*/
public function addcart($id,$name,$price1,$price2,$price3,$count,$image) {
$this->cartarray = $this->cartview(); // Read and write data into the array
if ($this->checkitem($id)) { // Check whether the item exists
$this->modifycart($id,$count,0); // Add $count to the quantity of goods
Return false;
}
$this->cartarray[0][$id] = $id;
$this->cartarray[1][$id] = $name;
$this->cartarray[2][$id] = $price1;
$this->cartarray[3][$id] = $price2;
$this->cartarray[4][$id] = $price3;
$this->cartarray[5][$id] = $count;
$this->cartarray[6][$id] = $image;
$this->save();
}
/**
* Modify items in shopping cart
*
* @param int $id product number
* @param int $count item quantity
* @param int $flag Modification type 0: Add 1: Subtract 2: Modify 3: Clear
* @return If the modification fails, return false
​*/
public function modifycart($id, $count, $flag = "") {
$tmpid = $id;
$this->cartarray = $this->cartview(); // Read and write data into the array
$tmparray = &$this->cartarray; // Reference
if (!is_array($tmparray[0])) return false;
if ($id < 1) {
Return false;
}
foreach ($tmparray[0] as $item) {
if ($item === $tmpid) {
switch ($flag) {
Case 0: // Add quantity. Generally $count is 1
$tmparray[5][$id] += $count;
        break;
Case 1: // Reduce quantity
$tmparray[5][$id] -= $count;
        break;
Case 2: // Modify quantity
If ($count == 0) {
​​​ unset($tmparray[0][$id]);
​​​ unset($tmparray[1][$id]);
​​​ unset($tmparray[2][$id]);
​​​ unset($tmparray[3][$id]);
​​​ unset($tmparray[4][$id]);
​​​ unset($tmparray[5][$id]);
​​​ unset($tmparray[6][$id]);
        break;
} else {
         $tmparray[5][$id] = $count;
        break;
        }
Case 3: // Clear items
        unset($tmparray[0][$id]);
        unset($tmparray[1][$id]);
        unset($tmparray[2][$id]);
        unset($tmparray[3][$id]);
        unset($tmparray[4][$id]);
        unset($tmparray[5][$id]);
        unset($tmparray[6][$id]);
        break;
Default:
        break;
}
}
}
$this->save();
}
/**
* Clear shopping cart
*
​*/
public function removeall() {
$this->cartarray = array();
$this->save();
}
/**
* View shopping cart information
*
* @return array Returns a two-dimensional array
​*/
public function cartview() {
$cookie = strips tutorial lashes($_cookie['cartapi']);
if (!$cookie) return false;
$tmpunserialize = unserialize($cookie);
Return $tmpunserialize;
}
/**
* Check if there are items in the shopping cart
*
* @return bool If there is a product, return true, otherwise false
​*/
public function checkcart() {
$tmparray = $this->cartview();
if (count($tmparray[0]) < 1) {
Return false;
}
Return true;
}
/**
* Product Statistics
*
* @return array Returns a one-dimensional array $arr[0]: the total price of product 1 $arr[1: the total price of product 2 $arr[2]: the total price of product 3 $arr[3]: the total price of product 3 Quantity
​*/
public function countprice() {
$tmparray = $this->cartarray = $this->cartview();
$outarray = array(); //One-dimensional array
// 0 is the total price of product 1
// 1 is the total price of product 2
// 2 is the total price of product 3
// 3 is the total quantity of products
$i = 0;
if (is_array($tmparray[0])) {
foreach ($tmparray[0] as $key=>$val) {
$outarray[0] += $tmparray[2][$key] * $tmparray[5][$key];
$outarray[1] += $tmparray[3][$key] * $tmparray[5][$key];
$outarray[2] += $tmparray[4][$key] * $tmparray[5][$key];
$outarray[3] += $tmparray[5][$key];
$i++;
}
}
return $outarray;
}
/**
* Count the number of products
*
* @return int
​*/
public function cartcount() {
$tmparray = $this->cartview();
$tmpcount = count($tmparray[0]);
$this->cartcount = $tmpcount;
return $tmpcount;
}
/**
* Save the product If you do not use the construction method, this method must use
*
​*/
public function save() {
$tmparray = $this->cartarray;
$tmpserialize = serialize($tmparray);
setcookie("cartapi",$tmpserialize,time()+$this->expires);
}
/**
* Check if the items in the shopping cart exist
*
* @param int $id
* @return bool if true otherwise false
​*/
private function checkitem($id) {
$tmparray = $this->cartarray;
if (!is_array($tmparray[0])) return;
foreach ($tmparray[0] as $item) {
if ($item === $id) return true;
}
return false;
}
}
?>