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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 7.0.0 - 7.2.0
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 5.4.2 - 5.6.28
Fatal error: Call to undefined function json_serialize() in /in/9FgAO on line 21
Process exited with code 255.
Output for 5.3.18 - 5.3.29
Fatal error: Interface 'JsonSerializable' not found in /in/9FgAO on line 11
Process exited with code 255.