Php uses session to implement the simplest way to implement the shopping cart class-PHP source code

Ec (2); classcart {& nbsp; ** & nbsp; * & nbsp; function name: & nbsp; & nbsp; addItem & nbsp; * & nbsp; function: & nbsp; add product & nbsp; * & nbsp; input parameter: script ec (2); script

Class cart
{
/**
* Function name: addItem
* Function: Add a product
* Input parameter: $ data ------------- item Array
* Function return value: none
* Other Instructions: because the data is recorded in the session, no response is required.
*/
Function addItem ($ data ){
Global $ config_kezhi;
If (is_array ($ data )&&! Empty ($ data )){
Foreach ($ data as $ key => $ val ){
// Add quantity and price if the product exists
If ($ this-> _ isExists ($ key )){

$ _ SESSION ['cart'] [$ key] ["paddy_count"] + = $ val ['Paddy _ count'];
$ _ SESSION ['cart'] [$ key] ["market_count"] + = $ val ['market _ count'];
$ _ SESSION ['cart'] [$ key] ["goodsnum"] + = intval ($ val ['goodsnum']);
$ Arr = $ this-> getItems ($ key );
// $ _ SESSION ['cart'] [$ key] ["count"] + = $ _ SESSION ['cart'] [$ key] ["price"];
/* If (strlen ($ _ SESSION ['cart'] [$ key] ["kezhi"])> 0) {// no lettering added
$ _ SESSION ['cart'] [$ key] ["eng_price"] = 0;
$ _ SESSION ['cart'] [$ key] ["eng_price"] = (int) $ config_kezhi * intval ($ arr ['num']);
} Else {
// Die ("dd ");
$ _ SESSION ['cart'] [$ key] ["eng_price"] = 0;
}*/
// Echo $ arr ['num'];
// Die ();

}
// Otherwise, join directly
Else
{
$ _ SESSION ['cart'] [$ key] = $ data [$ key];
// $ _ SESSION ['cart'] [$ key] ["name"] = $ val ['name'];
// $ _ SESSION ['cart'] [$ key] ["price"] = $ val ['price'];
// $ _ SESSION ['cart'] [$ key] ["count"] = round ($ val ['price'] * intval ($ val ['num']), 2 );
// $ _ SESSION ['cart'] [$ key] ["num"] = intval ($ val ['num']);
}
}
}
}

/**
* Function name: _ isExists
* Function: determines whether the product exists.
* Input parameter: $ id ---------- item ID
* Function return value: bool
* Other Instructions:
*/
Function _ isExists ($ id)
{
If (isset ($ _ SESSION ['cart'] [$ id]) &! Empty ($ _ SESSION ['cart'] [$ id]) & array_key_exists ($ id, $ _ SESSION ['cart'])
{
Return true;
}
Else
{
Return false;
}
}

/**
* Function name: modItem
* Function: modifies the number of items.
* Input parameter: $ id ------------ item ID
* $ Num ------------- number of items
* Function return value: return value description
* Other Instructions: Description
*/
Function modItem ($ id, $ num)
{
$ Arr = $ this-> getItems ($ id );
// Add quantity and price if the product exists
If ($ this-> _ isExists ($ id ))
{
$ _ SESSION ['cart'] [$ id] ["goodsnum"] = intval ($ num );
If ($ arr ['Paddy _ price_special ']> "0 "){
$ _ SESSION ['cart'] [$ id] ["paddy_count"] = round ($ arr ['Paddy _ price_special '] * intval ($ num), 2 );
} Elseif ($ arr ['Paddy _ userprice']> "0 "){
$ _ SESSION ['cart'] [$ id] ["paddy_count"] = round ($ arr ['Paddy _ userprice'] * intval ($ num), 2 );
} Elseif ($ arr ['Paddy _ spreadprice']> "0 "){
$ _ SESSION ['cart'] [$ id] ["paddy_count"] = round ($ arr ['Paddy _ spreadprice'] * intval ($ num), 2 );
} Else {
$ _ SESSION ['cart'] [$ id] ["paddy_count"] = round ($ arr ['Paddy _ price'] * intval ($ num), 2 );
}
$ _ SESSION ['cart'] [$ id] ["market_count"] = round ($ arr ['market _ price'] * intval ($ num), 2 );
}
}

/**
* Function name: modItem_wanwei
* Function: Modify the product wrist circumference
* Input parameter: $ id ------------ item ID
* $ Num ------------- product wrist circumference
* Function return value: return value description
* Other Instructions: Description
*/
Function modItem_wanwei ($ id, $ wanwei)
{
$ Arr = $ this-> getItems ($ id );
// Add quantity and price if the product exists
If ($ this-> _ isExists ($ id ))
{
$ _ SESSION ['cart'] [$ id] ["wanwei"] = intval ($ wanwei );

/// $ _ SESSION ['cart'] [$ id] ["count"] = round ($ arr ['price'] * intval ($ num), 2 );
}
}

// Function modItem_kezhi ($ id, $ kezhi)
//{
// Global $ config_kezhi;
// $ Arr = $ this-> getItems ($ id );
/// Add quantity and price if the product exists
// If ($ this-> _ isExists ($ id ))
//{
// $ _ SESSION ['cart'] [$ id] ["kezhi"] = $ kezhi;
// $ _ SESSION ['cart'] [$ id] ['price'] = $ arr ['price'] + $ config_kezhi;
// $ _ SESSION ['cart'] [$ id] ['Count'] = round ($ _ SESSION ['cart'] [$ id] ['price'] * intval ($ arr ['num']), 2 );
//}
//}


Function modItem_kezhi ($ id, $ kezhi, $ kezhi1 = "", $ kezhi2 = "")
{
Global $ config_kezhi;
$ Arr = $ this-> getItems ($ id );
// Add quantity and price if the product exists
// Var_dump ($ _ SESSION ['cart']);
// Die ();
If ($ this-> _ isExists ($ id ))
{
If (strlen ($ _ SESSION ['cart'] [$ id] ["kezhi"]) = 0 & strlen ($ kezhi )! = 0) {// no lettering added
// $ Arr ['price'] + = $ config_kezhi;
$ _ SESSION ['cart'] [$ id] ["eng_price"] = 0;
$ _ SESSION ['cart'] [$ id] ["eng_price"] = (int) $ config_kezhi * intval ($ arr ['num']);
// $ _ SESSION ['cart'] [$ id] ["price"] = $ arr ['price'];
// $ _ SESSION ['cart'] [$ id] ["count"] = round ($ arr ['price'] * intval ($ arr ['num']), 2 );
$ _ SESSION ['cart'] [$ id] ["kezhi"] = $ kezhi;
$ _ SESSION ['cart'] [$ id] ["kezhi1"] = $ kezhi1;
$ _ SESSION ['cart'] [$ id] ["kezhi2"] = $ kezhi2;
/// $ _ SESSION ['cart'] [$ id] ["count"] = round ($ arr ['price'] * intval ($ num), 2 );
} Elseif (strlen ($ _ SESSION ['cart'] [$ id] ["kezhi"])! = 0 & strlen ($ kezhi) = 0) {// with lettering removed
$ _ SESSION ['cart'] [$ id] ["eng_price"] = 0;
// $ _ SESSION ['cart'] [$ id] ["eng_price"]-= (int) $ config_kezhi * intval ($ arr ['num']);
// $ _ SESSION ['cart'] [$ id] ["eng_price"]-= $ config_kezhi;
// $ _ SESSION ['cart'] [$ id] ["price"] = $ arr ['price'];
// $ _ SESSION ['cart'] [$ id] ["count"] = round ($ arr ['price'] * intval ($ arr ['num']), 2 );
$ _ SESSION ['cart'] [$ id] ["kezhi"] = $ kezhi;
$ _ SESSION ['cart'] [$ id] ["kezhi1"] = $ kezhi1;
$ _ SESSION ['cart'] [$ id] ["kezhi2"] = $ kezhi2;
} Elseif (strlen ($ _ SESSION ['cart'] [$ id] ["kezhi"])! = 0 & strlen ($ kezhi )! = 0) {// with lettering, change the lettering
// $ _ SESSION ['cart'] [$ id] ["count"] = round ($ arr ['price'] * intval ($ arr ['num']), 2 );
// $ _ SESSION ['cart'] [$ id] ["eng_price"] = 0;
$ _ SESSION ['cart'] [$ id] ["eng_price"] = (int) $ config_kezhi * intval ($ arr ['num']);

$ _ SESSION ['cart'] [$ id] ["kezhi"] = $ kezhi;
$ _ SESSION ['cart'] [$ id] ["kezhi1"] = $ kezhi1;
$ _ SESSION ['cart'] [$ id] ["kezhi2"] = $ kezhi2;
}
}
}

/**
* Function name: getItems
* Function: obtains the product array.
* Input parameter: $ id ------------- ID of a product
* Function return value: array
* Other Instructions:
*/
Function getItems ($ id = null)
{
If (isset ($ _ SESSION ['cart'])
{
If ($ id = null)
{
// Print_r ($ _ SESSION ['cart']); exit;
Return $ _ SESSION ['cart'];
}
Else
{
Return $ _ SESSION ['cart'] [$ id];
}
}
}

/**
* Function name: emptyItem
* Function: delete a product.
* Input parameter: $ id ----------- item ID
* Function return value: bool
* Other Instructions:
*/
Function emptyItem ($ id = null)
{
If ($ id = null)
{
Unset ($ _ SESSION ['cart']);
}
Else
{
Unset ($ _ SESSION ['cart'] [$ id]);
}
}

/**
* Function name: sum
* Function: calculates the total price.
* Input parameter: none
* Function return value: int
* Other Instructions:
*/
Function sum ()
{
$ Total = 0;
If (isset ($ _ SESSION ['cart']) &! Empty ($ _ SESSION ['cart'])
{
Foreach ($ _ SESSION ['cart'] as $ key => $ val)
{
$ Total + = $ val ['Count'];
}
}
Return $ total;
}
}