Error Identifier: interface.duplicateMethod
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 Foo
{
public function doSomething(): void;
public function doSomething(): int;
}
Why is it reported? #
The interface declares the same method name more than once. PHP does not allow redeclaring methods within a single interface (or class/enum) definition, and this will cause a fatal error. Method names are compared case-insensitively, so doSomething() and DoSomething() are considered the same method.
How to fix it #
Remove the duplicate method declaration:
interface Foo
{
public function doSomething(): void;
-
- public function doSomething(): int;
}
If two different methods are intended, give them distinct names:
interface Foo
{
public function doSomething(): void;
- public function doSomething(): int;
+ public function doSomethingElse(): int;
}
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\Classes\DuplicateDeclarationRule [1]