Redefining constants in PHP

Is it possible to redefine a constant in php which was defined by the define function? I have a class with several constants that contains the user data. I’m trying to use the class for more than one user.

define('ALLEGRO_ID', 'id');
define('ALLEGRO_LOGIN', 'login');
define('ALLEGRO_PASSWORD', 'passwd');
define('ALLEGRO_KEY', 'key');
define('ALLEGRO_COUNTRY', 123);

$allegro = new AllegroWebAPI( );                
$allegro -> Login();

I did not write this class, but I am using it due to time constraints. I do not know why the creator of this class defined the user data rather than using the variables in the instance.

I know that constants should be constant (obviously!), but I’m looking for a trick to redefine them.

Answer

If you have the runkit extension installed, you can use runkit_constant_redefine():

runkit_constant_redefine("name", "value");

In most circumstances, however, it would be a better idea to re-evaluate why you’re using constants and not something more fitting.