" . mysqli_error($conn); } // Close database connection mysqli_close($conn); ?>In this example, we are using the mysqli package library to connect to and manipulate a MySQL database. The code first checks if the connection is successful, then creates an SQL statement to insert a new user into the "users" table. If the SQL statement is executed successfully, it outputs a success message, otherwise it outputs an error message. Finally, the database connection is closed. Other examples of PHP user insert functionality might include adding new users to a custom CMS, creating user accounts for an e-commerce site, or registering new members for a forum or social network. The specific implementation may vary depending on the requirements of the application or website being built.