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<?php class A implements JsonSerializable{ public $baz = 10; function jsonSerialize(){ return ['bar' => 20]; } } class B implements JsonSerializable{ function jsonSerialize(){ return ['foo' => new A]; } } echo json_encode(new B, JSON_PRETTY_PRINT);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of A::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/XTWcj on line 5 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/XTWcj on line 11 { "foo": { "bar": 20 } }

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