150) { $form->getElement('age')->setError('Invalid age entered'); } ?>
getElement('username')->setError('Incorrect username or password entered'); $form->getElement('password')->setError('Incorrect username or password entered'); } ?>In this code, we are checking if the username and password entered by the user match the correct credentials. If they don't match, then we are setting an error message using the setError() function for both the username and password input fields. Overall, the setError() function is a useful way to add error messages to form elements. It belongs to the PHP Form library, which provides various functions and classes to work with HTML forms in PHP.