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<?php class SerializableObject implements JsonSerializable { public function jsonSerialize() { return array('foo' => 'bar'); } } class MultipleNonCircularReference implements JsonSerializable { public function jsonSerialize() { $obj = new SerializableObject(); return array('a' => 123); } } var_dump(json_encode(new SerializableObject()));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of SerializableObject::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/h1T6l on line 5 Deprecated: Return type of MultipleNonCircularReference::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/h1T6l on line 13 string(13) "{"foo":"bar"}"

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