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<?php abstract class AbstractEvent { protected $id; private $hidden; } class Event extends AbstractEvent implements JsonSerializable { private $value; public function jsonSerialize() { return get_object_vars(); } } $e = new Event(); echo json_serialize($event);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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/9FgAO on line 14 Fatal error: Uncaught Error: Call to undefined function json_serialize() in /in/9FgAO:21 Stack trace: #0 {main} thrown in /in/9FgAO on line 21
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Uncaught Error: Call to undefined function json_serialize() in /in/9FgAO:21 Stack trace: #0 {main} thrown in /in/9FgAO on line 21
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Call to undefined function json_serialize() in /in/9FgAO on line 21
Process exited with code 255.

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