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<?php new A(); class A { public function jsonSerialize() { return []; } } class B implements JsonSerializable { public function jsonSerialize() { return []; } } new B();
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of B::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/s0dK8 on line 11

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