constant.notFound - Phpstan

Code example

php

<?php declare(strict_types = 1);

echo UNDEFINED_CONSTANT;

Why is it reported?

The code references a constant that PHPStan cannot find. This usually means the constant does not exist, is defined in a file that PHPStan does not scan, or is provided by an extension that is not loaded.

How to fix it

If the constant is defined elsewhere, make sure PHPStan can discover it by including the file in scanFiles or scanDirectories:

neon

parameters:
    scanFiles:
        - constants.php

If the constant name is a typo, correct it:

diff-php

 <?php declare(strict_types = 1);

-echo UNDEFNED_CONSTANT;
+echo UNDEFINED_CONSTANT;