Php 如何将两个数组中的特定值合并到一个数组中（有例外）？

我有以下两个不同的数组

第一个阵列：

Array
(
    [0] => stdClass Object
        (
            [course_id] => 21
            [session_id] => 17
            [course_name] => Session 1 Course 1
            [course_description] => Session 1 Course 1
            [course_days] => 2
            [current_rate] => 1000
            [old_rate] => 
            [primary_tutor_id] => 18
            [secondary_tutor_id] => 25
            [additional_time] => 
            [location] => 
            [course_active] => 1

        )

    [1] => stdClass Object
        (
            [course_id] => 22
            [session_id] => 17
            [course_name] => Session 1 Course 2
            [course_description] => Session 1 Course 2
            [course_days] => 3
            [current_rate] => 1000
            [old_rate] => 
            [primary_tutor_id] => 24
            [secondary_tutor_id] => 25
            [additional_time] => 
            [location] => 
            [course_active] => 1

        )

    [2] => stdClass Object
        (
            [course_id] => 23
            [session_id] => 17
            [course_name] => Session 1 Course 3
            [course_description] => Session 1 Course 3
            [course_days] => 5
            [current_rate] => 2000
            [old_rate] => 
            [primary_tutor_id] => 26
            [secondary_tutor_id] => 27
            [additional_time] => 
            [location] => 
            [course_active] => 1

        )

    [3] => stdClass Object
        (
            [course_id] => 26
            [session_id] => 19
            [course_name] => Session 3 Course 2
            [course_description] => Session 3 Course 2
            [course_days] => 2
            [current_rate] => 400
            [old_rate] => 
            [primary_tutor_id] => 29
            [secondary_tutor_id] => 29
            [additional_time] => 
            [location] => 
            [course_active] => 1

        )

    [4] => stdClass Object
        (
            [course_id] => 27
            [session_id] => 19
            [course_name] => Session 3 Course 3
            [course_description] => Session 3 Course 3
            [course_days] => 1
            [current_rate] => 200
            [old_rate] => 
            [primary_tutor_id] => 26
            [secondary_tutor_id] => 
            [additional_time] => 
            [location] => 
            [course_active] => 1                
        )

)

第二个阵列：

Array
(
    [0] => stdClass Object
        (
            [discount_id] => 104
            [session_id] => 17
            [no_course] => 3
            [discount] => 20                
        )

    [1] => stdClass Object
        (
            [discount_id] => 106
            [session_id] => 19
            [no_course] => 2
            [discount] => 20            

        )

)

我试图将第二个数组中的所有键和值组合到第一个数组中，如下面的示例所示

Array
(
    [0] => stdClass Object
        (
            [course_id] => 21
            [session_id] => 17
            [course_name] => Session 1 Course 1
            [course_description] => Session 1 Course 1
            [course_days] => 2
            [current_rate] => 1000
            [old_rate] => 
            [primary_tutor_id] => 18
            [secondary_tutor_id] => 25
            [additional_time] => 
            [location] => 
            [course_active] => 1
            [discount_id] => 104
            [session_id] => 17
            [no_course] => 3
            [discount] => 20

        )
)

我已经尝试了以下代码和许多其他代码，但我不能得到完美的解决方案。在这两个数组中，如果两个[session_id]都相同，则需要以其他方式合并数组，因为它是未合并的数组，则有一个例外：

$main=array();
foreach ($courses as $key => $val) {    
            foreach ($session_discount as $se) {
                if ($se->session_id == $val->session_id)
                    $main[$key] = $val;
                array_push($main[$key], $session_discount[0]);
            }
        }

---

需要帮助。。！提前谢谢。

你知道数组和对象的区别吗？是的，我知道，我贴错了什么，先生？是的，

$main[$key]

是对象，很抱歉，我在编写代码时感到困惑，我曾尝试过多次转换它，但它返回空值，而不是

array\u push

尝试如下操作：

$main[$key]->some\u prop='some Value'