PHP update table in MySQL not working - php

Question

My php won't update my products table. I know my GET request worked as I tested it with echo to display the id. I am confused as to how I can get it to work? I think it may be something to do with the form action= on my form but I am confused! Can someone please help?
<?php
// Connection file
require 'db.php';
if (((!empty($_GET["mode"])) && (!empty($_GET["id"]))) && ($_GET["mode"] == "update")) {
// If update
echo $_GET['id'];
if (isset($_POST["updateSubmit"])) {
$pName = $_POST["updateProductName"];
echo $pName;
$query = "UPDATE products "
. "SET p_name = '" . $_POST["updateProductName"] . "', "
. "p_type = '" . $_POST["updateProductType"] . "', "
. "p_desc = '" . $_POST["updateProductDesc"] . "', "
. "p_price = '" . $_POST["updateProductPrice"] . "', "
. "p_stock = " . $_POST["updateProductStock"] . ", "
. "WHERE id=" . $_GET['id'] . ";";
$result = mysqli_query($conn, $query);
}
}
?>
<div>
<form id="updateForm" name="updateForm" action="<?php echo "?mode=update&id=" . $productDetails["id"]; ?>" method="post">
<label>Product name:</label><br>
<input type="text" name="updateProductName"><br>
<label>Product type</label><br>
<select name="updateProductType">
<option value="Jackets/coats">Jackets/coats</option>
<option value="Accessories">Accessories</option>
<option value="Shirts">Shirts</option>
<option value="Jeans">Jeans</option>
<option value="Trousers">Trousers</option>
<option value="Shoes">Shoes</option>
<option value="Suits">Suits</option>
</select>
<p>Product description:</p>
<textarea name="updateProductDesc" rows="10" cols="30"></textarea><br>
<label>Product price:</label><br>
<input type="text" name="updateProductPrice"><br>
<label>Stock level:</label><br>
<input type="text" name="updateProductStock"><br>
<input type="submit" name="updateSubmit" value="Submit">
</form>
</div>
<?php
?>

Answer 1

I think the problems are misusing of ' in one or both of these lines
. "p_price = '" . $_POST["updateProductPrice"] . "', "
. "p_stock = " . $_POST["updateProductStock"] . ", "
If the type is string you need to use ' as you used in p_price otherwise if it is float or int you should not use ' as you did for p_stock.
It seems you used wrong for these two field. Since the p_price would be float and p_stock is string.
. "p_price = " . $_POST["updateProductPrice"] . ", "
. "p_stock = '" . $_POST["updateProductStock"] . "' , "

Answer 2

There are two issues with your query...
You Have one extra comma before the Where Section and your missing delimeters on p_stock.
Should be:
"p_stock = '" . $_POST["updateProductStock"] . "' "
and
. "WHERE id='" . $_GET['id'] . "'";