php-怎樣刪除二維數組中相同的一位元組 並保持相同鍵名 求大神寫個函數

php數組

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

[rebuild_grade] =>

[begin_college] => 旅遊文化產業學院
[remark] =>

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

                    [1] => Array                            (                                    [year] => 2013-2014                                    [term] => 1                                    [course_code] => 00008069                                    [course_name] => 咖啡世界                                    [course_nature] => 任意選修                                    [course_attribution] => 人文素養類                                    [credit] => 2.0                                    [point] => 4.1                                    [grade] => 91                                    [minor_tag] => 0                                    [makeup_grade] =>                                      [rebuild_grade] =>                                      [begin_college] => 旅遊文化產業學院                                    [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] => 任意選修                                    [course_attribution] => 人文素養類                                    [credit] => 2.0                                    [point] => 4.1                                    [grade] => 91                                    [minor_tag] => 0                                    [makeup_grade] =>                                      [rebuild_grade] =>                                      [begin_college] => 旅遊文化產業學院                                    [remark] =>                                      [rebuild_tag] => 0                                    [0] => 77                                    [1] => 2                            )

)

如上面 怎樣讓它變成
Array
(
[0] => Array
(
[year] => 2013-2014
[term] => 1
[course_code] => 00008069
[course_name] => 咖啡世界
[course_nature] => 任意選修
[course_attribution] => 人文素養類
[credit] => 2.0
[point] => 4.1
[grade] => 91
[minor_tag] => 0
[makeup_grade] =>

[rebuild_grade] =>

[begin_college] => 旅遊文化產業學院
[remark] =>

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

