Error Identifier: function.notFound

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?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:

 <?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:

parameters:
    scanFiles:
        - functions.php

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

How to ignore this error #

You can use the identifier function.notFound to ignore this error using a comment:

// @phpstan-ignore function.notFound
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: function.notFound

Rules that report this error #

PHPStan\Rules\Functions\CallToNonExistentFunctionRule [1]
PHPStan\Rules\Functions\FunctionCallableRule [1]
PHPStan\Rules\Namespaces\ExistingNamesInGroupUseRule [1]
PHPStan\Rules\Namespaces\ExistingNamesInUseRule [1]

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