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<?php class Foo implements JsonSerializable { public function jsonSerialize() { return json_encode([1], JSON_PRETTY_PRINT); } } echo json_encode([new Foo]), "\n";
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/13Srm on line 4 ["[\n 1\n]"]

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