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Editorial Team
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Asked: 2026-05-28T07:58:29+00:00

I know to define a constant, you do something like this define(CONSTANT, Hello world.);

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I know to define a constant, you do something like this

define("CONSTANT", "Hello world.");

if I want to change the value of the constant I would have to do define() again? Why couldn’t I just do CONSTANT = "whatever"; after it has already been defined the first time?

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  1. Editorial Team

    The whole point of a constant is that it is constantly and always the same. You can not change a constant after you defined it.

    Even using define("CONSTANT", "Hello world."); would return an error.

    I just did it real fast to show you what you’d get:

    Notice: Constant CONSTANT already defined in /Users/stokholm/test.php on line 3

Call Stack:
    0.0003     629992   1. {main}() /Users/stokholm/test.php:0
    0.0171     630232   2. define() /Users/stokholm/test.php:3
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