Product data is not getting inserted in phpmySQL - php

Question

I am trying to add products through PHP inside PHP MySQL but somehow the code is not inserting the data inside the database while running without any errors. I am not sure if there's any mistake in the PHP or in the PHP MySQL. I hope I'll get some answers here. Here's my code:
HTML
<div id="content">
<form method="GET" action="" enctype="multipart/form-data">
<input type="text" name="productName" value="" placeholder="Product Name">
<input type="text" name="quantity" placeholder="Quantity">
<input type="text" name="regularPrice" placeholder="Regular Price">
<input type="text" name="discountedPrice" placeholder="discountedPrice">
<input type="file" name="uploadfile" value="" />
<input type="text" name="category" placeholder="Category">
<div>
<button type="submit" name="productImage">Add Product</button>
</div>
</form>
</div>
PHP CODE:
<?php
error_reporting(0);
?>
<?php
$msg = "";
// If upload button is clicked ...
if (isset($_GET['productImage']))
{
$productName = $_GET['productName'];
$quantity = $_GET['quantity'];
$regPrice = $_GET['regularPrice'];
$discPrice = $_GET['discountedPrice'];
$productImage = $_FILES["uploadfile"]["name"];
$tempname = $_FILES["uploadfile"]["tmp_name"];
$category = $_GET['category'];
$folder = "asset/images/products/".$productImage;
$host = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbname = "kewalsmart";
// Creating Connection
$conn = new mysqli($host, $dbUsername, $dbPassword, $dbname);
if(mysqli_connect_error())
{
die('Connection Error('. mysql_connect_errno().')'. mysqli_connect_error());
}
else
{
$SELECT = "SELECT email From products Where product_name = ? Limit 1";
// Get all the submitted data from the form
$INSERT = "INSERT INTO products (product_name, quantity, regular_price, discounted_price, product_image, category) VALUES ('$productName, $quantity, $regPrice, $discPrice, $productImage, $category')";
// Prepare Statement
$stmt = $conn->prepare($SELECT);
$stmt->bind_param("s", $productName);
$stmt->execute();
$stmt->bind_result($productName);
$stmt->store_result();
$rnum = $stmt->num_rows;
if($rnum==0)
{
$stmt->close();
$stmt = $conn->prepare($INSERT);
$stmt->bind_param("ssiiss", $productName, $quantity, $regPrice, $discPrice, $productImage, $category);
$stmt->execute();
?>
<script type="text/javascript">
window.alert("Product Added Successfully");
window.location.href = "index.html";
</script>
<?php
}
else
{
?>
<script>
window.alert("Something's Wrong");
setTimeout(function(){ window.location.href = "./"; }, 2000);
</script>
<?php
}
// Now let's move the uploaded image into the folder: image
if (move_uploaded_file($tempname, $folder))
{
$msg = "Image uploaded successfully";
}
else
{
$msg = "Failed to upload image";
}
$stmt->close();
$conn->close();
}
}
?>
Thank you in advance!