PHP Session Array - store same item with different values -

i'm working on php cart system , have got problem.

the problem:

when user adds item , again, adds same item different values (different size or quantity) cart updates entry new values that's chosen user. previous details gets deleted.

solution have been looking for

if users adds item, , wants add same item different requirements, should added separate entry int cart session.(only if specific variable gets changed, example: single product different sizes).

how can in current code?

the cart

//add item in shopping cart if(isset($_post["type"]) && $_post["type"]=='add') {     $product_code   = filter_var($_post["product_code"], filter_sanitize_string); //product code     $product_size   = filter_var($_post["product_size"], filter_sanitize_number_int); //product size     $product_qty    = filter_var($_post["product_qty"], filter_sanitize_number_int); //product quantity     $return_url     = base64_decode($_post["return_url"]); //return url       //mysqli query - details of item db using product code     $results = $connection->query("select * products prod_code='$product_code' limit 1");     $obj = $results->fetch_object();      if ($results) { //we have product info           //prepare array session variable         $new_product = array(array('name'=>$obj->product_name, 'code'=>$product_code, 'size'=>$product_size, 'qty'=>$product_qty, 'price'=>$obj->price));          if(isset($_session["products"])) //if have session         {             $found = false; //set found item false              foreach ($_session["products"] $cart_itm) //loop through session array             {                 if($cart_itm["code"] == $product_code){ //the item exist in array                      $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'size'=>$product_size, 'qty'=>$product_qty, 'price'=>$cart_itm["price"]);                     $found = true;                 }else{                     //item doesn't exist in list, retrieve old info , prepare array session var                     $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'size'=>$cart_itm["size"], 'qty'=>$cart_itm["qty"], 'price'=>$cart_itm["price"]);                 }             }              if($found == false) //we didn't find item in array             {                 //add new user item in array                 $_session["products"] = array_merge($product, $new_product);             }else{                 //found user item in array list, , increased quantity                 $_session["products"] = $product;             }          }else{             //create new session var if not exist             $_session["products"] = $new_product;         }      }      //redirect original page     header('location:'.$return_url); } 

looking forward helpful answers.

thanks

***** update ******

code remove product cart:

//remove item shopping cart if(isset($_get["removep"]) && isset($_get["return_url"]) && isset($_session["products"])) {     $product_code   = $_get["removep"]; //get product code remove     $return_url     = base64_decode($_get["return_url"]); //get return url       foreach ($_session["products"] $cart_itm) //loop through session array var     {         //if($cart_itm["code"]!=$product_code){ //item does,t exist in list         if($cart_itm["code"] != $product_code && $cart_itm["size"] != $product_size){             $product[] = array(             'name'=>$cart_itm["name"],             'code'=>$cart_itm["code"],             'size'=>$cart_itm["size"],             'qty'=>$cart_itm["qty"],             'price'=>$cart_itm["price"]             );         }          //create new product list cart         $_session["products"] = $product;     }      //redirect original page     header('location:'.$return_url); } 

the if condition using mistake did. try one

if($cart_itm["code"] == $product_code && $cart_itm["size"] == $product_size) 

instead of

if($cart_itm["code"] == $product_code) 

the method of checking quantity not practice since can edit quantity alone in existing entry.