By typing inurl:php?id=1 into Google, anyone could find a list of thousands of potential targets in seconds.
If you are a developer, avoid these risks by using and Parameterized Queries (like PDO in PHP) rather than manually building SQL strings with user input. If you'd like, I can: inurl php id 1 link
In this example, the URL is requesting a PHP page called "product.php" and passing an ID value of "1" as a parameter. The server-side script can then use this ID value to retrieve specific data from a database and display it on the page. By typing inurl:php