What are the potential consequences of not providing a parameter to the mysqli_error() function?

If a parameter is not provided to the mysqli_error() function, it will return the error message associated with the last MySQLi function call. This can lead to confusion if multiple MySQLi functions are called in succession. To ensure the correct error message is returned, always provide the MySQLi connection object as a parameter to the mysqli_error() function.

// Incorrect way
$error = mysqli_error();

// Correct way
$error = mysqli_error($connection);