How to add values from array to textbox in a while loop - php

Question

I have products on a loop in a shopping cart, but the values of qty is not appearing it have this error on every textbox. Notice: Array to string conversion in C:\xampp\htdocs\ecommerce\cart.php on line 172Array
<?php
$total = 0;
global $con;
$ip = getIp();
$sel_price = "select * from cart where ip_add='$ip'";
$run_price = mysqli_query($con, $sel_price);
while($p_price=mysqli_fetch_array($run_price)){
$pro_id = $p_price['p_id'];
$pro_price = "select * from products where product_id='$pro_id'";
$run_pro_price = mysqli_query($con,$pro_price);
while ($pp_price = mysqli_fetch_array($run_pro_price)){
$product_price = array($pp_price['product_price']);
$product_title = $pp_price['product_title'];
$product_image = $pp_price['product_image'];
$single_price = $pp_price['product_price'];
$single_price = number_format($single_price);
$values = array_sum($product_price);
$total += $values;
$pro_qty = "select * from cart where p_id='$pro_id'";
$run_pro_qty = mysqli_query($con,$pro_qty);
while ($pp_qty = mysqli_fetch_array($run_pro_qty)){
$product_qty = array($pp_qty['qty']);
?>
<tr align="center">
<td><input type="checkbox" name="remove[]" value="<?php echo $pro_id;?>"/></td>
<td><?php echo $product_title; ?><br>
<img src="admin_area/product_images/<?php echo $product_image;?>" width="60" height="60"/>
</td>
<td><input type="text" size="4" name="qty" value="<?php echo $product_qty;?>"/></td>
<td><?php echo "Php " . $single_price; ?></td>
</tr>
<?php } }?>