合并两个对象数组，得到唯一的对象PHP

这里我需要一些关于合并两个数组的帮助。

这是我有的样本代码

    $tasks = array();
    $task_user = new Task_User;
    $task_user->setUserId($this->session_data['userId']);
    $user_taskIds = $this->getUserTasks($task_user);
    foreach ($user_taskIds as $row) {
        $task = new Task;
        // $task->setBranchId($branch_id);
        $task->setTaskId($row->getTaskId());
        $tasks[] = $this->getTask($task);
    }
    echo "<pre>";
    print_r($tasks);
    $pageData['userTasks'] = $tasks;
    $task = new Task;
    // $task->setBranchId($branch_id);
    $task->setCreated($this->session_data['userId']);
    $tasks1 = $this->getBranchTasks($task);
    if (!empty($tasks1[0]))
    {
        $pageData['userTasks'] = $tasks1;
    }
    print_r($tasks1);
    print_r($pageData['userTasks']);

$this->load->view（'home'，$pageData）；

输出：

Array
(
    [0] => Task Object
        (
            [task_id:Task:private] => 22
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 121
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000022
        )
    [1] => Task Object
        (
            [task_id:Task:private] => 24
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 1046
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000024
        )
)
Array
(
    [0] => Task Object
        (
            [task_id:Task:private] => 9
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 599
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000009
        )
    [1] => Task Object
        (
            [task_id:Task:private] => 10
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 313
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000010
        )
)
Array
(
    [0] => Task Object
        (
            [task_id:Task:private] => 9
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 599
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000009
        )
    [1] => Task Object
        (
            [task_id:Task:private] => 10
            [service_id:Task:private] => 1
            [branch_id:Task:private] => 1
            [customer_id:Task:private] => 313
            [lead_id:Task:private] => 0
            [name:Task:private] => YTY0000010
        )
)

所以，最后我需要两个对象数组应该与唯一的对象组合，并将其传递给一个数组。我试了6个小时。但是我拿不到。请帮帮我提前感谢。