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<?php class Foo implements JsonSerializable { public $ddd = 'hello'; function jsonSerialize() { return 'foobar'; } } var_dump(json_encode(new Foo));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/LGrqC on line 5 string(8) ""foobar""

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