Not able insert data into table? : I'm able to see all the data that i have entered in form but not able to insert it into table.

    <?php
    echo "u r at starting";
    $product_title = $_POST["product_title"];
	$product_cat = $_POST["product_cat"];
	$cat = $_POST["cat"];
	$product_price = $_POST["product_price"];
	$product_keywords = $_POST["product_keywords"];
	$product_desc = $_POST["product_desc"];

	$product_img1 = $_FILES["product_img1"]["name"];
	$product_img2 = $_FILES["product_img2"]["name"];
	$product_img3 = $_FILES["product_img3"]["name"];

	echo $product_title;
	echo $product_cat;
	echo $cat;
	echo $product_price;
	echo $product_keywords;
	echo $product_desc;
	echo $product_img1;
	echo $product_img2;
	echo $product_img3;


    if(isset($_POST["abc"]))
    {
	
	$temp_name1 = $_FILES["product_img1"]["tmp_name"];
	$temp_name2 = $_FILES["product_img2"]["tmp_name"];
	$temp_name3 = $_FILES["product_img3"]["tmp_name"];

	move_uploaded_file($temp_name1, "product_images/img1");
	move_uploaded_file($temp_name2, "product_images/img2");
	move_uploaded_file($temp_name3, "product_images/img3");

	$insert_product = "INSERT INTO product_tab VALUES 
 ('$product_cat','$cat_id',NOW(),'$product_title','$product_img1','$product_img2','$product_img3','$product_price','$product_keywords','$product_desc')";

	$run_product = mysqli_query($con,$insert_product);
	echo $run_product;
	if($run_product)
	{

		echo "Product inserted successfully";
	}
	else
	{
		echo "NOt inserted";
	}
    }
    echo "end";
    ?>