我使用以下函数，其中$task是TaskData实例的数组
var_dump(array_pop($task));
// outputs when used repeatdly:
object(TaskData)[18]
private 'id_task' => string '4' (length=1)
private 'name' => null
private 'process_id' => null
object(TaskData)[22]
private 'id_task' => string '9' (length=1)
private 'name' => null
private 'process_id' => null
object(TaskData)[27]
private 'id_task' => string '18' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[46]
private 'id_task' => string '42' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[18]
private 'id_task' => string '47' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[36]
private 'id_task' => string '57' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[35]
private 'id_task' => string '63' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[41]
private 'id_task' => string '68' (length=2)
private 'name' => null
private 'process_id' => null
object(TaskData)[26]
private 'id_task' => string '70' (length=2)
private 'name' => null
private 'process_id' => null
如何访问id_task项（在示例中：'4','9','18','42'）？
$task似乎是TaskData实例的数组。您尝试联系的会员是私人会员。读能见度
private 'id_task'
如果它是公开的，它可以通过这种方式到达：
foreach ($task as $taskData) {
var_dump($taskData->id_task);
}
你完全正确，为私人会员设置一个公共getter是一个更好的主意：
public function getTaskID() {
return $this->id_task;
}