Change the value of a previously-defined constant

Question

I have defined a constant in PHP e.g.

define('CONSTANT_NAME', 'constant_value'); 

I want to be able to change the value of this constant later on in the code.

Can this be done? If so, how?

Answer 1

From http://php.net/manual/en/function.define.php (emphasis is mine):

define — Defines a named constant

From http://www.php.net/manual/en/language.constants.php:

As the name suggests, that value cannot change during the execution of the script