<?php

// get the product key
$product_key = $_GET['product_key'];

// Create MySQLi connection
$conn = new mysqli( $my_servername, $my_username, $my_password, $my_schema );

$sql = "select
        product_key,
        product_name,
        product_description,
        product_price,
        product_image_url
from
        product_tbl
where
        product_key = " . $product_key ;

$conn->multi_query( $sql );