function.notFound - Phpstan

Code example

php

<?php declare(strict_types = 1);

echo undefinedFunction();

Why is it reported?

The code calls a function that PHPStan cannot find. This usually means the function does not exist, is misspelled, or is defined in a file that PHPStan does not scan (such as a conditionally loaded file or an extension stub).

How to fix it

If the function name is a typo, correct it:

diff-php

 <?php declare(strict_types = 1);

-echo aray_merge([1], [2]);
+echo array_merge([1], [2]);

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

neon

parameters:
    scanFiles:
        - functions.php

If the function comes from a PHP extension, make sure PHPStan knows about it by adding the appropriate extension stubs.