It seems like you code against a concrete implementation and not the interface WBW\Bundle\CoreBundle\Provider\ProviderInterface as the method getDomain() does only exist in the following implementations of said interface: WBW\Bundle\CoreBundle\Color\AbstractColorProvider, WBW\Bundle\CoreBundle\Color\AmberColorProvider, WBW\Bundle\CoreBundle\Color\BlueColorProvider, WBW\Bundle\CoreBundle\Color\BlueGreyColorProvider, WBW\Bundle\CoreBundle\Color\BrownColorProvider, WBW\Bundle\CoreBundle\Color\CyanColorProvider, WBW\Bundle\CoreBundle\Co...DeepOrangeColorProvider, WBW\Bundle\CoreBundle\Co...DeepPurpleColorProvider, WBW\Bundle\CoreBundle\Color\GreenColorProvider, WBW\Bundle\CoreBundle\Color\GreyColorProvider, WBW\Bundle\CoreBundle\Color\IndigoColorProvider, WBW\Bundle\CoreBundle\Color\LightBlueColorProvider, WBW\Bundle\CoreBundle\Co...LightGreenColorProvider, WBW\Bundle\CoreBundle\Color\LimeColorProvider, WBW\Bundle\CoreBundle\Co...ette\AmberColorProvider, WBW\Bundle\CoreBundle\Co...ette\BlackColorProvider, WBW\Bundle\CoreBundle\Co...lette\BlueColorProvider, WBW\Bundle\CoreBundle\Co...e\BlueGreyColorProvider, WBW\Bundle\CoreBundle\Co...ette\BrownColorProvider, WBW\Bundle\CoreBundle\Co...lette\CyanColorProvider, WBW\Bundle\CoreBundle\Co...DeepOrangeColorProvider, WBW\Bundle\CoreBundle\Co...DeepPurpleColorProvider, WBW\Bundle\CoreBundle\Co...ette\GreenColorProvider, WBW\Bundle\CoreBundle\Co...lette\GreyColorProvider, WBW\Bundle\CoreBundle\Co...tte\IndigoColorProvider, WBW\Bundle\CoreBundle\Co...\LightBlueColorProvider, WBW\Bundle\CoreBundle\Co...LightGreenColorProvider, WBW\Bundle\CoreBundle\Co...lette\LimeColorProvider, WBW\Bundle\CoreBundle\Co...tte\OrangeColorProvider, WBW\Bundle\CoreBundle\Co...lette\PinkColorProvider, WBW\Bundle\CoreBundle\Co...tte\PurpleColorProvider, WBW\Bundle\CoreBundle\Co...alette\RedColorProvider, WBW\Bundle\CoreBundle\Co...lette\TealColorProvider, WBW\Bundle\CoreBundle\Co...ette\WhiteColorProvider, WBW\Bundle\CoreBundle\Co...tte\YellowColorProvider, WBW\Bundle\CoreBundle\Color\OrangeColorProvider, WBW\Bundle\CoreBundle\Color\PinkColorProvider, WBW\Bundle\CoreBundle\Color\PurpleColorProvider, WBW\Bundle\CoreBundle\Color\RedColorProvider, WBW\Bundle\CoreBundle\Color\TealColorProvider, WBW\Bundle\CoreBundle\Color\YellowColorProvider, WBW\Bundle\CoreBundle\Quote\AbstractQuoteProvider, WBW\Bundle\CoreBundle\Quote\QuoteProvider.
Let’s take a look at an example:
interfaceUser{/** @return string */publicfunctiongetPassword();}classMyUserimplementsUser{publicfunctiongetPassword(){// return something}publicfunctiongetDisplayName(){// return some name.}}classAuthSystem{publicfunctionauthenticate(User$user){$this->logger->info(sprintf('Authenticating %s.',$user->getDisplayName()));// do something.}}
In the above example, the authenticate() method works fine as long as you just pass
instances of MyUser. However, if you now also want to pass a different implementation
of User which does not have a getDisplayName() method, the code will break.
classAuthSystem{publicfunctionauthenticate(User$user){if($userinstanceofMyUser){$this->logger->info(/** ... */);}// or alternativelyif(!$userinstanceofMyUser){thrownew\LogicException('$user must be an instance of MyUser, '.'other instances are not supported.');}}}
Note: PHP Analyzer uses reverse abstract interpretation to narrow down the types
inside the if block in such a case.
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: