" . $category . ""; } // Close database connection mysqli_close($connection); ?>This code retrieves all the categories of a specific item with an ID of 1 from the database and displays them as a list on the webpage. This example uses the MySQLi extension, which is a package library included in PHP that allows developers to connect and interact with MySQL databases. In summary, the getCategories function in PHP is useful in creating a structured and organized content system on a website. It can be easily implemented using a package library such as MySQLi or PDO, depending on the database system used.