Get a list of constants outside of PHP class [duplicate]

Question

I'm trying to get a list of all the constants that are defined outside of a PHP class but only if they start with a specific prefix (see this tutorial) and saw the ReflectionClass::getConstants functionality but this requires a class.

How do I achieve the same functionality if the constants are defined outside of a class?

Thanks! An obvious solution eluded me.. I should hand my developer membership card now. — dokgu
– dokgu, Commented May 9, 2019 at 21:15

Dharman · Accepted Answer · 2019-05-09 21:28:33Z

1

You can use the built-in function get_defined_constants. It will list all the constants even the ones coming from Core PHP and loaded extensions. You can pass true as the parameter to categorize them. To get just userland constants (both from const and from define()) use get_defined_constants(true)['user']

<?php

define('DEFINED_CONST', 'foo');
const myConst = 1;

print_r(get_defined_constants(true)['user']);

prints:

Array
(
    [DEFINED_CONST] => foo
    [myConst] => 1
)

answered May 9, 2019 at 21:28

Dharman♦

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