php chart item cannot adding quantity - php

Question

hi all my name is Fadil Raditya
i am stuck in some code in php. I really need help.
i want add item in chart from selected item how ever it can not increment.
this is some of my code.
<?php session_start();
require_once("dbcontroller.php");
$db_handle = new DBController();
if(!empty($_GET["action"])) {
switch($_GET["action"]) {
case "add":
if(!empty($_POST["quantity"])) {
$productByCode = $db_handle->runQuery("SELECT * FROM tblproduct WHERE code='" . $_GET["code"] . "'");
$itemArray = array($productByCode[0]["code"]=>array('name'=>$productByCode[0]["name"], 'code'=>$productByCode[0]["code"], 'quantity'=>$_POST["quantity"], 'price'=>$productByCode[0]["price"]));
if(!empty($_SESSION["cart_item"])) {
if(in_array($productByCode[0]["code"],$_SESSION["cart_item"])) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($productByCode[0]["code"] == $k)
{
$_SESSION["cart_item"][$k]["quantity"] = $_POST["quantity"];
}
}
}
else {
$_SESSION["cart_item"] = array_merge($_SESSION["cart_item"],$itemArray);
}
} else {
$_SESSION["cart_item"] = $itemArray;
}
}
break;
and i want call adding the quantity when hit the add chart button
<?php
$product_array = $db_handle->runQuery("SELECT * FROM tblproduct ORDER BY id DESC");
if (!empty($product_array)) {
foreach($product_array as $key=>$value){
?>
<div class="col-xs-6 col-sm-3 col-md-3">
<div class="team-wrapper-big">
<form method="post" action="index.php?action=add&code=<?php echo $product_array[$key]["code"]; ?>">
<h6><?php echo $product_array[$key]["name"]; ?></h6>
<img src="<?php echo $product_array[$key]["image"]; ?>">
<?php echo "Rp ".$product_array[$key]["price"]; ?>
<hr>
<img src="img/VIEW.png">
<input type="text" name="quantity" value="1" placeholder="quantity in number" />
<input type="submit" value="Add to cart" class="btnAddAction" src="img/BUY.png">
<hr>
</form>
</div>
</div>
<?php
}
}
?>
This is the ouput source
<div id="shopping-cart">
<div class="txt-heading"></div>
<?php
if(isset($_SESSION["cart_item"])){
$item_total = 0;
?><center>
<table cellpadding="10" cellspacing="3" border="1">
<tbody>
<tr>
<th><strong>Name</strong></th>
<th><strong>Code</strong></th>
<th><strong>Quantity</strong></th>
<th><strong>Price</strong></th>
<th><strong>Total Price</strong></th>
<th><strong>Action</strong></th>
</tr>
<?php
foreach ($_SESSION["cart_item"] as $item){
?>
<tr>
<td><strong><?php echo $item["name"]; ?></strong></td>
<td><?php echo $item["code"]; ?></td>
<td><?php echo $item["quantity"]; ?></td>
<?php $_SESSION["track"] = $item["quantity"]; ?>
<td align=right><?php echo "Rp. ".$item["price"]; ?></td>
<td align=right><?php echo "Rp. ".$item["quantity"]*$item["price"]; ?></td>
<td>Remove Item</td>
</tr>
<?php
$item_total += ($item["price"]*$item["quantity"]);
}
?>
<tr>
<td colspan="6" align=right><strong>Total:</strong> <?php echo "Rp. ".$item_total; ?></td>
</tr>
</tbody>
</table> </center>
<?php
}
?><a id="btnEmpty" href="index.php?action=empty">Empty Cart</a>
</div>
i hope anyone can help me. need suggestion and solution. open to discussion.
regards
Fadil Raditya