Implementation code of php shopping cart class (single case mode)-PHP Tutorial-php.cn

Implementation code of php shopping cart class (single case mode)

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Release： 2016-07-25 08:59:33

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/**
* php shopping cart class
* Singleton mode
* Edit bbs.it-home.org
*/
class Cart{
static protected $ins; //Instance variable
protected $item = array(); //Place items Container
//External calls are prohibited
final protected function __construct(){
}
//Cloning is prohibited
final protected function __clone(){
}
//Internal instantiation of the class
static protected function Getins(){
if(!(self::$ins instanceof self)){
self::$ins = new self() ;
}
return self::$ins;
}
//In order to save the product across pages, put the object into the session
public function Getcat(){
if(!($_SESSION['cat']) || !($_SESSION['cat'] instanceof self)){
$_SESSION['cat'] = self::Getins();
}
return $_SESSION['cat'];
}
//Check when enqueueing, whether it exists in $item.
public function Initem($goods_id){
if($this->Gettype() == 0){
return false;
}
if(!(array_key_exists($goods_id,$this->item))){
return false;
}else{
return $this->item[$goods_id]['num']; //Return the number of this product
}
}
//Add one Goods
public function Additem($goods_id,$name,$num,$price){
if($this->Initem($goods_id) != false){
$this->item[$goods_id][' num'] += $num;
return;
}
$this->item[$goods_id] = array(); //A product is an array
$this-> ;item[$goods_id]['num'] = $num; //Purchase quantity of this product
$this->item[$goods_id]['name'] = $name; //Product name
$this ->item[$goods_id]['price'] = $price; //unit price of the item
}
//reduce one item
public function Reduceitem($goods_id,$num){
if($this->Initem($goods_id) == false){
return;
}
if($num > $this->Getunm($goods_id)){
unset($this-> item[$goods_id]);
}else{
$this->item[$goods_id]['num'] -=$num;
}
}
//Remove one Goods
public function Delitem($goods_id){
if($this->Initem($goods_id)){
unset($this->item[$goods_id]);
}
}
//Return to the list of purchased items
public function Itemlist(){
return $this->item;
}
//How many types of items are there in total?
public function Gettype( ){
return count($this->item);
}
//Get the total number of a product
public function Getunm($goods_id){
return $this- >item[$goods_id]['num'];
}
// Check how many items are in the shopping cart
public function Getnumber(){
$num = 0;
if ($this->Gettype() == 0){
return 0;
}
foreach($this->item as $k=>$v){
$ num += $v['num'];
}
return $num;
}
//Calculate the total price
public function Getprice(){
$price = 0;
if ($this->Gettype() == 0){
return 0;
}
foreach($this->item as $k=>$v){
$ price += $v['num']*$v['num'];
}
return $price;
}
//Clear the shopping cart
public function Emptyitem(){
$this->item = array();
}
}
?>

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Call example:

include_once('Cart.php');
$cart = Cart::Getcat();
$cart->Additem('1','php learning tutorial (programmer Home Edition)','5','9999');
print_r($cart);
?>

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