A Practical PHP Shopping cart Program

Practical PHP Tutorial Shopping Cart Program
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<?php
Invoke instance
Require_once ' cart.class.php ';
Session_Start ();
if (!isset ($_session[' cart ')) {
$_session[' cart ' = new cart;
}
$cart =& $_session[' cart '];

if (($_server[' Request_method ']== "POST") && ($_post[' action ']== ' add ') {
$p = $_post[' P '];
$items = $cart->add ($p);
}
if (($_get[' action ']== ' remove ') && ($_get[' key ']!= "")) {
$items = $cart->remove ($_get[' key ');
}

If (($_server[' Request_method ']== "POST") && ($_post[' action ']== ' Modi ') {
$key = $_post[' key ');
$ Value = $_post[' value '];
for ($i =0; $i <count ($key), $i) {
$items = $cart->modi ($key [$i], $value [$i]);
}
}

$items = $cart->getcart ();
//Print
echo "<table border=1>";
SetLocale (lc_monetary, ' it_it ');
foreach ($items as $item) {
echo "<tr><form method=" post "action=" tmp.php ">";
echo "<td> ID: ". $item [' id ']." <input Type=hidden name=key[] value= ". $item [' ID ']." > ";
Echo <td> Products: ". $item [' name '];
Echo <td> Unit Price: ". $item [' prices '];
echo "<td><input type=text name=value[] value=". $item [' Count ']. " > ";
$sum = $item [' Count ']* $item [' Price '];
Echo <td> total: ". Round ($sum, 2);
echo "<td><input type=button value= ' delete ' onclick= ' location= '? action=remove&key= '. $item [' ID ']." ' " > ";
}
Echo "<input type=hidden name=action value=modi>";
echo "<tr><td colspan=7><input type=submit/>";
echo "</td></form></tr></table>";

?>
<form method= "POST" action= "tmp.php" >
Id:<input type= "text" Name= "p[]"/>
Name: <input type= "text" Name= "p[]"/>
Price: <input type= "text" Name= "p[]"/>
Quantity: <input type= "text" Name= "p[]"/>
<input Type=hidden name=action value=add>
<input type= "Submit"/>
</form>

<?
/**
* Cart
*
* Shopping Cart Category
*
* @author Doodoo<[email protected]>
* @package Cart
* @category Cart
* @license PHP License
* @access Public
* @version $Revision: 1.10 $
*/
Class cart{

var $cart;
var $totalCount; Total quantity of goods
var $totalPrices; Total amount of goods

/**
* Cart Constructor
*
* class constructor, so that the shopping cart to maintain a stable initialization state
*
* @static
* @access Public
* @return void no return value
* @param void no parameter
*/
function Cart () {
$this->totalcount = 0;
$this->totalprice = 0;
$this->cart = Array ();
}

// }}}
{{{Add ($item)

/**
* Add item to current shopping cart
*
* @access Public
* @param array $item product information (one-dimensional array: Array (Product ID, product name, commodity unit price, number of items))
* @return Array returns the list of items in the current shopping cart
*/
function Add ($item) {
if (!is_array ($item) | | Is_null ($item)) return $this->cart;
if (!is_numeric (end ($item)) | | (!is_numeric (prev ($item)))) {
echo "Price and quantity must be number";
return $this->cart;
}
Reset ($item); This sentence is necessary because the above judgment has moved the indicator of the array
$key = current ($item);
if ($key = = "") Return $this->cart;
if ($this->_isexists ($key)) {//Does the product already exist?
$this->cart[$key [' count '] = end ($item);
return $this->cart;
}

$this->ca (www.111cn.net) rt[$key [' ID '] = $key;
$this->cart[$key [' name '] = next ($item);
$this->cart[$key [' price '] = next ($item);
$this->cart[$key [' count '] = next ($item);

return $this->cart;
}

// }}}
{{{Add ($item)

/**
* Remove some or all of the items from your current shopping cart
* when $key = = "", Empty the current cart
* When $key! = "&& $count = =" ", Pick all items from your current cart with the item ID number $key
* When $key! = "&& $count! =" ", pick a $count item ID number $key from your current cart
*
* @access Public
* @param string $key Product ID
* @return Mixed returns an array of TRUE or false items in the current shopping cart
*/
function Remove ($key = "", $count = "") {
if ($key = = "") {
$this->cart = Array ();
return true;
}
if (!array_key_exists ($key, $this->cart)) return false;
if ($count = = "") {//Remove this type of product
unset ($this->cart[$key]);
}else{//Removal of $count items
$this->cart[$key [' count ']-= $count;
if ($this->cart[$key] [' count ']<=0) unset ($this->cart[$key]);
}
return $this->cart;
}

// }}}
{{{Modi ($key, $value)

/**
* Change the number of items in the cart with the product ID $key $value
*
* @access Public
* @param string $key Product ID
* @param int $value number of items
* @return Array Returns a list of items in the current shopping cart;
*/
Function Modi ($key, $value) {
if (! $this->_isexists ($key)) return $this->cart (); This product does not exist and is returned directly
if ($value <=0) {//value is too small, delete all
unset ($this->cart[$key]);
return $this->cart;
}
$this->cart[$key [' count '] = $value;
return $this->cart;
}

/**
* Returns an array of items in the current shopping cart
*
* @access Public
* @return Array Returns a list of items in the current shopping cart;
*/
function Getcart () {
return $this->cart;
}

// }}}
{{{_isexists ($key)

/**
* Determine if there is a product ID number $key in the current shopping cart
*
* @access Private
* @param string $key Product ID
* @return bool True or false;
*/
function _isexists ($key)
{
if (Isset ($this->cart[$key]) &&!empty ($this->cart[$key]) &&array_key_exists ($key, $this, CART))
return true;
return false;
}

// }}}
{{{isEmpty ()}

/**
* Determine if the current shopping cart is empty, i.e. there is no product
*
* @access Public
* @return bool True or false;
*/
function IsEmpty () {
Return!count ($this->cart);
}

// }}}
{{{_stat ()}

/**
* Access to some statistical information
*
* @access Private
* @return bool True or false;
*/
function _stat () {
if ($this->isempty ()) return false;
foreach ($this->cart as $item) {
$this->totalcount = @end ($item);
$this->totalprices = @prev ($item);
}
return true;
}

// }}}
{{{totalprices ()}

/**
* Total amount of all items in the current shopping cart
*
* @access Public
* @return float return amount;
*/
function Totalprices () {
if ($this->_stat ())
return $this->totalprices;
return 0;
}

// }}}
{{{isEmpty ()}

/**
* Get the total quantity of all items in the current shopping cart and
*
* @access Public
* @return int;
*/
function TotalCount () {
if ($this->_stat ())
return $this->totalcount;
return 0;
}

}//end Class Cart
?>
From:http://www.111cn.net/phper/php-gj/39684.htm

A Practical PHP Shopping cart Program