Error Identifier: parameter.void
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);
function doFoo(void $param): void // ERROR: Parameter $param has typehint with void.
{
}
Why is it reported? #
The void type cannot be used as a parameter type in PHP. The void type is only valid as a return type, where it indicates that the function does not return a value. Using void as a parameter type is a language-level error that will cause a fatal error at runtime.
How to fix it #
Use the appropriate type for the parameter. If the parameter is intended to accept no meaningful value, consider whether the parameter is needed at all:
<?php declare(strict_types = 1);
-function doFoo(void $param): void
+function doFoo(): void
{
}
If the parameter should accept any type including null, use mixed:
<?php declare(strict_types = 1);
-function doFoo(void $param): void
+function doFoo(mixed $param): void
{
}
Non-ignorable error #
This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.
Rules that report this error #
- PHPStan\Rules\Functions\ExistingClassesInArrowFunctionTypehintsRule [1] [2]
- PHPStan\Rules\Functions\ExistingClassesInClosureTypehintsRule [1] [2]
- PHPStan\Rules\Functions\ExistingClassesInTypehintsRule [1] [2]
- PHPStan\Rules\Methods\ExistingClassesInTypehintsRule [1] [2]
- PHPStan\Rules\Properties\ExistingClassesInPropertyHookTypehintsRule [1] [2]