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<?php abstract class AbstractEvent { protected $id; private $hidden; } final class Event extends AbstractEvent implements JsonSerializable { private $value; public function __construct() { $this->id = 5; $this->value = 'abc'; } public function jsonSerialize() { return get_object_vars($this); } } $e = new Event(); echo json_encode($e);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of Event::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/qR1h0 on line 20 {"id":5,"value":"abc"}

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