php-怎样删除二维数组中相同的一位数组 并保持相同键名 求大神写个函数

php数组

Array
(
[0] => Array
(
[year] => 2013-2014
[term] => 1
[course_code] => 00008069
[course_name] => 咖啡世界
[course_nature] => 任意选修
[course_attribution] => 人文素养类
[credit] => 2.0
[point] => 4.1
[grade] => 91
[minor_tag] => 0
[makeup_grade] =>

[rebuild_grade] =>

[begin_college] => 旅游文化产业学院
[remark] =>

[rebuild_tag] => 0
[0] => 77
[1] => 2
)

<code>                    [1] => Array                            (                                    [year] => 2013-2014                                    [term] => 1                                    [course_code] => 00008069                                    [course_name] => 咖啡世界                                    [course_nature] => 任意选修                                    [course_attribution] => 人文素养类                                    [credit] => 2.0                                    [point] => 4.1                                    [grade] => 91                                    [minor_tag] => 0                                    [makeup_grade] =>                                      [rebuild_grade] =>                                      [begin_college] => 旅游文化产业学院                                    [remark] =>                                      [rebuild_tag] => 0                                    [0] => 77                                    [1] => 2                            )                    [2] => Array                            (                                    [year] => 2013-2014                                    [term] => 1                                    [course_code] => 00008069                                    [course_name] => 咖啡世界                                    [course_nature] => 任意选修                                    [course_attribution] => 人文素养类                                    [credit] => 2.0                                    [point] => 4.1                                    [grade] => 91                                    [minor_tag] => 0                                    [makeup_grade] =>                                      [rebuild_grade] =>                                      [begin_college] => 旅游文化产业学院                                    [remark] =>                                      [rebuild_tag] => 0                                    [0] => 77                                    [1] => 2                            )</code>

)

如上面 怎样让它变成
Array
(
[0] => Array
(
[year] => 2013-2014
[term] => 1
[course_code] => 00008069
[course_name] => 咖啡世界
[course_nature] => 任意选修
[course_attribution] => 人文素养类
[credit] => 2.0
[point] => 4.1
[grade] => 91
[minor_tag] => 0
[makeup_grade] =>

[rebuild_grade] =>

[begin_college] => 旅游文化产业学院
[remark] =>

[rebuild_tag] => 0
[0] => 77
[1] => 2
)
}