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<?php interface SerializableInterface {}; interface SomeResizableInterface {}; interface IterableInterface {}; trait SomeSerializableTrait {}; trait SomeOtherSerializableTrait {}; class SomeContainer implements SerializableInterface, IterableInterface { use SomeSerializableTrait; } class SomeOtherContainer extends SomeContainer implements SomeResizableInterface { use SomeOtherSerializableTrait; } $someContainer = new SomeContainer; $someOtherContainer = new SomeOtherContainer; var_dump($someContainer instanceof SerializableInterface); var_dump($someOtherContainer instanceof SerializableInterface); var_dump($someOtherContainer instanceof SomeSerializableTrait); var_dump($someOtherContainer instanceof SomeOtherSerializableTrait); // type hint it function testTrait(SomeSerializableTrait $container) {} function testOtherTrait(SomeOtherSerializableTrait $container) {} function testInterface(SomeResizableInterface $container) {} testInterface($someOtherContainer); testOtherTrait($someOtherContainer); testTrait($someOtherContainer);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) bool(false) bool(false) Fatal error: Uncaught TypeError: testOtherTrait(): Argument #1 ($container) must be of type SomeOtherSerializableTrait, SomeOtherContainer given, called in /in/r3fid on line 32 and defined in /in/r3fid:28 Stack trace: #0 /in/r3fid(32): testOtherTrait(Object(SomeOtherContainer)) #1 {main} thrown in /in/r3fid on line 28
Process exited with code 255.

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