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<?php class A implements JsonSerializable { public function jsonSerialize() { return 'A'; } } $b = []; $b[] = new A(); $b[] = new A(); var_dump(json_encode($b));
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/n0PPI on line 4 string(9) "["A","A"]"

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