Hi,
I am using MVC concept to create a basic shopping cart for learning purposes, I have no problem adding/ deleting/ updating items in my cart, but I want to add the timestamp when an item is created into my cart, I still cannot think of a proper method I can achieve this…
It would be wonderful if you have any ideas!
Below is the codes.
This is the code call the cart controller,
#includes the configuration
require_once('inc/global.inc.php');
#includes classes into the application
require ('class_lib.php');
#starts the session
session_start();
$cart_controller = new __cart_controller();
$cart_controller -> invoke_cart($template = 'view.php');
This is the classes of cart, product (model, controller, entity),
/**
* this file handles the retrieval and serving of page
*/
class __cart_controller
{
private $cart_model;
public function __construct()
{
$this -> cart_model = new __cart_model();
}
public function invoke_cart($template)
{
#presets the variables
$action = null;
if(isset($_GET['action'])) $action = $_GET['action'];
#invoke the __cart_model class, assigning the object to a session variable
if (!isset($_SESSION[CART]))
{
$cart = $this -> cart_model;
}
else
{
$cart = unserialize($_SESSION[CART]);
}
#proccessing the item in the cart
if($action == 'update')
{
foreach ($_POST as $key => $value)
{
#updates the qunatity of an item
$cart -> update_quantity($key,$value);
}
#always place this line below the method of add_item, of delete_item, and update_quantity
$_SESSION[CART] = serialize($cart);
#get the main template
include $template;
}
elseif($action == 'delete')
{
#removes a product from the cart
$cart -> delete_item($_REQUEST['pro_id']);
#always place this line below the method of add_item, of delete_item, and update_quantity
$_SESSION[CART] = serialize($cart);
#get the main template
include $template;
}
else
{
#adds a product to the cart
$cart -> add_item($_REQUEST['pro_id']);
//$cart -> add_item($_REQUEST['pro_id'],$time = time());
#always place this line below the method of add_item, of delete_item, and update_quantity
$_SESSION[CART] = serialize($cart);
print_r($cart);
#get the main template
include $template;
/*
* for checking purposes only :-
*
*
#make the cart an array to store multiple items.
$cart2 = array();
#make the cart store the session.
$cart2 = $_SESSION['cart_1'];
#store the item in array.
$cart2[] = $_GET['pro_id'];
#make the designated session remember previous items otherwise each new session will replace the previous one.
$_SESSION['cart_1'] = $cart2;
#for instance, Array ( [0] => 2 [1] => 3 [2] => 4 ) .
print_r($cart2);
#put the cart into condiction.
if (!isset($_SESSION['cart2']))
{
$cart2 = array();
}
else
{
$cart2 = $_SESSION['cart2'];
}
$cart2[$_REQUEST['pro_id']] = array();
$cart2[$_REQUEST['pro_id']]['id'] = $_REQUEST['pro_id'];
$cart2[$_REQUEST['pro_id']]['created'] = time();
$_SESSION['cart2'] = $cart2;
print_r($cart2);
*
*
*/
}
}
}
/**
* The store model.
*
*/
class __store_model
{
/**
* holds instance of database connection
*/
protected $database;
public function __construct()
{
$this -> database = new __database(DB_HOST,DB_USER,DB_PASS,DB_NAME);
}
public function get_store()
{
#prepare the query
$sql = "
SELECT * FROM root_products
LEFT JOIN root_pages
ON root_products.pg_id = root_pages.pg_id
ORDER BY root_pages.pg_created
";
#execute the query and store the array in the variale
$product = $this->database->fetch_all($sql);
#return the result
return $product;
}
}
/**
* The product model.
*
*/
class __product_model extends __store_model
{
public function get_product($pro_id)
{
#prepare the query
$sql = "
SELECT * FROM root_products
LEFT JOIN root_pages
ON root_products.pg_id = root_pages.pg_id
WHERE root_products.pro_id = '".$pro_id."'
";
#execute the query and store the array in the variale
$product = $this->database->fetch_assoc($sql);
#send it to the entity class and instantiate an object from it
$product = new __product_entity($product);
#return the result
return $product;
}
}
/**
* The product entity.
*
*/
class __product_entity
{
public $pro_id = null;
public $pro_title = null;
public $pro_price = null;
/**
* fetch the array and keep the data in varibales
* @param string $page
*/
public function __construct($product)
{
$this->pro_id = $product['pro_id'];
$this->pro_title = $product['pg_title'];
$this->pro_price = $product['pro_price_primary'];
//print_r($product);
}
}
/**
* The shopping cart.
*
*/
class __cart_model
{
private $content = array();
private $created;
/**
* The class constructor
*
*/
public function __construct()
{
$this->created = time();
}
/**
* Add a product to the cart
* @access public
* @param $pro_id integer
*
*/
//public function add_item($pro_id,$time)
public function add_item($pro_id)
{
if (isset($this->content[$pro_id]))
{
$this->content[$pro_id]++;
/*$this->content[$pro_id] = array();
$this->content[$pro_id]['q'] = $this->content[$pro_id]['q'] + 1;
$this->content[$pro_id]['t'] = $time;
*/
}
else
{
$this->content[$pro_id] = 1;
/*
$this->content[$pro_id] = array();
$this->content[$pro_id]['q'] = 1;
$this->content[$pro_id]['t'] = $time;
echo $time;
*/
}
//print_r($this->content);
}
/**
* Remove product from cart
* @access public
* @param $pro_id integer
*
*/
public function delete_item($pro_id)
{
if (isset($this->content[$pro_id]))
{
unset($this->content[$pro_id]);
}
}
/**
* Change the quantity of a particular item held in the shopping cart
*
* @access public
* @param integer $pro_id
* @param integer $quantity
*/
public function update_quantity($pro_id, $quantity)
{
$this->content[$pro_id] = $quantity;
}
/**
* Get all items currently in cart
*
* @access public
* @return unknown
*/
public function get_items()
{
return $this->content;
}
/**
* How many items are in the user's cart?
*
* @access public
* @return INTEGER
*
*/
public function count_items()
{
return array_sum($this->content);
}
/**
* Calculate the cost of all items in the cart
* @access public
* @return float
*
*/
public function calculate_cost()
{
$cost = 0.00;
foreach($this->content AS $pro_id => $quantity)
{
//$cost = $cost + ($product -> price * $quantity);
# Instantiate the object from the class.
$product = new __product_model();
# Pass the parameter and access the method in the class.
$product = $product->get_product($pro_id);
# Calculate the total cost.
$cost = $cost + ($product -> pro_price * $quantity);
}
return number_format($cost, 2);
//return $cost_float;
}
}
I have tried to create a multidimensional array to pass the function of time() into the class method of add_item(), as below, but it generate an error message when an previous item is already set in the session/ array.
public function add_item($pro_id,$time)
{
if (isset($this->content[$pro_id]))
{
//$this->content[$pro_id]++;
$this->content[$pro_id] = array();
$this->content[$pro_id]['q'] = $this->content[$pro_id]['q'] + 1;
$this->content[$pro_id]['t'] = $time;
}
else
{
//$this->content[$pro_id] = 1;
$this->content[$pro_id] = array();
$this->content[$pro_id]['q'] = 1;
$this->content[$pro_id]['t'] = $time;
}
//print_r($this->content);
}
result:
Notice: Undefined index: q in C:\wamp\www\…
This is the live test site (without the error above) to show u what I intend to achieve,
http://lauthiamkok.net/tmp/php/cart/cart.php?pro_id=1
(note: you need to add the item by changing the value of pro_id from 1 to 4 so that u can see the shopping cart. bcos the index page won’t work on this live site for some reason, with this line of code,
$store = $object_store -> get_store();
but it works perfectly on my localhost!
this is the code to get the list of the items on the index page,
<?php
$object_store = new __store_model();
$store = $object_store -> get_store();
foreach ($store as $product)
{
$product = new __product_entity($product);
?>
<li><?php echo $product -> pro_title;?> by <?php //echo $product -> pro_author;?>: £<?php echo $product -> pro_price;?><br />
<a href="cart.php?pro_id=<?php echo $product -> pro_id;?>">Add to cart</a>
</li>
<?php
}
?>
)
Many thanks!
Lau
