What is the difference between `mysqli_error()` and `$mysqli->error` in PHP?

Both `mysqli_error()` and `$mysqli->error` retrieve the error message from the last MySQLi operation. However, `$mysqli->error` is the object-oriented approach, accessed via a MySQLi object instance (e.g., `$connection->error`), while `mysqli_error()` is the procedural approach, requiring the connection resource as an argument (e.g., `mysqli_error($connection)`).