Error Identifier: parameter.notVariadic
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);
interface Handler
{
public function handle(string ...$args): void;
}
class MyHandler implements Handler
{
public function handle(string $args): void
{
}
}
Why is it reported? #
A method parameter is declared as non-variadic, but the corresponding parameter in the parent method or interface is variadic. This violates the Liskov Substitution Principle – code that calls the parent method with multiple arguments would fail when the overriding method is called instead.
In the example above, Handler::handle() accepts any number of string arguments, but MyHandler::handle() accepts only one.
How to fix it #
Make the parameter variadic to match the parent declaration:
class MyHandler implements Handler
{
- public function handle(string $args): void
+ public function handle(string ...$args): void
{
}
}
How to ignore this error #
You can use the identifier parameter.notVariadic to ignore this error using a comment:
// @phpstan-ignore parameter.notVariadic
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: parameter.notVariadic