Not able to update 2 items using php and mysqli - php

Question

I have a table where I want to update data in 2 rows.
Heres my code:
<?php
include("includes/conn.php");
session_start();
if(!isset($_SESSION['username']))
{
header('Location: login.php');
}
else{
?>
<?php
$page_title = 'Update Order';
include("includes/header.inc.php");
?>
<?php if( $_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['update-order']) ){
if( !empty($_POST['productname']) && !empty($_POST['quantity']) && !empty($_POST['price']) && !empty($_POST['amount']) ){
$total = 0;
$pid = mysqli_real_escape_string($db,$_POST['pid']);
$advance = mysqli_real_escape_string($db,$_POST['advance_paid']);
$dod = mysqli_real_escape_string($db,$_POST['dod']);
$dod = date('Y-m-d', strtotime($dod));
$mop = mysqli_real_escape_string($db,$_POST['mop']);
for($i = 0; $i<count($_POST['productname']); $i++)
{
$total = $total + $_POST['amount'][$i];
$query = "UPDATE `invoice` SET product_name = (select name from item where id = '{$_POST['productname'][$i]}'), quantity = '{$_POST['quantity'][$i]}', price = '{$_POST['price'][$i]}', discount = '{$_POST['discount'][$i]}', amount = '{$_POST['amount'][$i]}', dod = '{$dod}', added_by = '{$_SESSION['id']}' WHERE id = '{$pid}' ";
mysqli_query($db, $query);
$update_stock = "UPDATE `item` SET added_by = '{$_SESSION['id']}', total_stock = total_stock + '{$_SESSION['quant']}' - '{$_POST['quantity'][$i]}' WHERE id = '{$_POST['productname'][$i]}'";
mysqli_query($db, $update_stock);
}
$query_orders = "UPDATE `orders` SET amount = '{$total}', dod = '{$dod}', mop = '{$mop}', advance = '{$advance}', added_by = '{$_SESSION['id']}' WHERE order_id = '{$_POST['orderid']}' ";
mysqli_query($db, $query_orders);
}
}
?>
<div id="alteration-form">
<div style="width: 90%; margin: 0 auto;">
<form method="GET" action="">
<label for="update_orderno" >Order NO.</label>
<input type="text" name="orderno" class="input-field" id="update_orderno" />
<input type="submit" name="find-order" value="Search Order" class="btn-all-submit" id="btn-order" />
</form>
</div>
</div>
<?php if( $_SERVER["REQUEST_METHOD"] == "GET" ){ ?>
<?php
if( !empty($_GET['orderno']) ){
$orderno = $_GET['orderno'];
$sql_cust = "SELECT cust_id FROM `orders` where order_id = '$orderno' ";
$result_cust = mysqli_query($db, $sql_cust);
if( mysqli_num_rows($result_cust) > 0 ){
while( $row_cust = mysqli_fetch_array($result_cust, MYSQLI_ASSOC) ){
$cust_id = $row_cust['cust_id'];
}
$sql_name = "SELECT * FROM `users` WHERE id = '$cust_id' ";
$result_name = mysqli_query($db, $sql_name);
if( mysqli_num_rows($result_name) > 0 ){
while( $row_name = mysqli_fetch_array($result_name, MYSQLI_ASSOC) ){
$name = $row_name['name'];
$phone = $row_name['phone'];
$address = $row_name['address'];
$city = $row_name['city'];
$state = $row_name['state'];
}
}
}
?>
<div class="result-table-div">
<div class="divRow">
<div class="divCell" ><strong>Name:</strong></div>
<div class="divCell" ><?php echo $name; ?></div>
<?php if(!empty($phone)){ ?>
<div class="divCell" ><strong>Phone:</strong></div>
<div class="divCell" ><?php echo $phone; ?></div>
<?php } ?>
</div>
<div class="divRow">
<?php if(!empty($address)){ ?>
<div class="divCell" ><strong>Address:</strong></div>
<div class="divCell" ><?php echo $address; ?></div>
<?php } ?>
<?php if(!empty($city)){ ?>
<div class="divCell" ><strong>City:</strong></div>
<div class="divCell" ><?php echo $city; ?></div>
<?php } ?>
</div>
<div class="divRow">
<?php if(!empty($state)){ ?>
<div class="divCell" ><strong>State:</strong></div>
<div class="divCell" ><?php echo $state; ?></div>
<?php } ?>
</div>
</div>
<div class="result-table-div">
<form method="POST" action="">
<div class="divRow">
<div class="divCell" ><strong>Date of Delivery:</strong></div>
<div class="divCell" ><input type="text" name="dod" id="dod" value="<?php echo date("m/d/Y"); ?>"/></div>
<div class="divCell" ><strong>Mode of Payment:</strong></div>
<div class="divCell" >
<select name="mop">
<option value="cash">Cash</option>
<option value="card/cheque/online banking">Card/Cheque/Online Banking</option>
</select>
</div>
</div>
<table id="invoice-table">
<thead>
<tr>
<th>S No.</th>
<th>Item</th>
<th>Quantity</th>
<th>Price</th>
<th>Discount</th>
<th>Amount</th>
</tr>
</thead>
<tbody>
<?php
$sql = "SELECT * FROM invoice where order_id = '$orderno' ";
$result = mysqli_query($db, $sql);
if( mysqli_num_rows($result) > 0 ){
$count = 1;
while( $row = mysqli_fetch_array($result,MYSQLI_ASSOC) ){
$id = $row['id'];
$product_name = $row['product_name'];
$quantity = $row['quantity'];
$price = $row['price'];
$discount = $row['discount'];
$amount = $row['amount'];
$_SESSION['cust_id'] = $row['cust_id'];
$_SESSION['quant'] = $quantity;
?>
<tr>
<input type="hidden" name="pid" value="<?php echo $id; ?>" />
<td><?php echo $count++; ?></td>
<!--<td><input type="text" name="productname[]" value="?php echo $product_name ?>"></td>-->
<td>
<select name="productname[]">
<option value="1" <?php if( isset($product_name) && strtolower($product_name) == "bags" ) echo "selected"; ?> >Bags</option>
<option value="2" <?php if( isset($product_name) && strtolower($product_name) == "shoes" ) echo "selected"; ?> >Shoes</option>
<option value="3" <?php if( isset($product_name) && strtolower($product_name) == "suit" ) echo "selected"; ?> >Suit</option>
<option value="4" <?php if( isset($product_name) && strtolower($product_name) == "belts" ) echo "selected"; ?> >Belts</option>
<option value="5" <?php if( isset($product_name) && strtolower($product_name) == "t-shirts" ) echo "selected"; ?> >T-shirts</option>
<option value="6" <?php if( isset($product_name) && strtolower($product_name) == "others" ) echo "selected"; ?> >Others</option>
</select>
</td>
<td><input type="text" class="quantity" name="quantity[]" value="<?php echo $quantity ?>"></td>
<td><input type="text" class="price" name="price[]" value="<?php echo $price ?>"></td>
<td><input type="text" class="discount" name="discount[]" value="<?php echo $discount ?>"></td>
<td><input type="text" class="amount" name="amount[]" value="<?php echo $amount ?>"></td>
</tr>
<?php
}
?>
<input type="hidden" name="orderid" value="<?php echo $orderno; ?>">
<?php
}
?>
</tbody>
</table>
<p style="text-align: center;">Advanced Paid: <input type="text" name="advance_paid" /></p>
<div class="btn-div">
<input type="submit" class="btn-all-submit" name="update-order" value="Update Order">
</div>
</form>
</div>
<?php } } ?>
<script>
$('body').delegate('.quantity,.price,.discount','keyup',function()
{
var tr=$(this).parent().parent();
var qty=tr.find('.quantity').val();
var price=tr.find('.price').val();
var dis=tr.find('.discount').val();
var amt =(qty * price)-(qty * price *dis)/100;
tr.find('.amount').val(amt);
});
</script>
<?php include("includes/footer.inc.php"); ?>
<?php } ?>
I am using for loop to update the data but if I have 2 items to update, it is only updating second item and not the first one. Can someone please help me with this.
Problem occurs while updating invoice table.

Answer 1

I found the solution for my problem.
Query should be
$query = "UPDATE `invoice` SET product_name = (select name from item where id = '{$_POST['productname'][$i]}'), quantity = '{$_POST['quantity'][$i]}', price = '{$_POST['price'][$i]}', discount = '{$_POST['discount'][$i]}', amount = '{$_POST['amount'][$i]}', dod = '{$dod}', added_by = '{$_SESSION['id']}' WHERE id = '{$_POST['pid'][$i]}' ";
mysqli_query($db, $query);