关于php减少数组维度的问题 求大神支招

<code>                                    )                            )                    )            )        [1] => Array            (                [2012] => Array                    (                        [1] => Array                            (                                [term_point] => 3.5                                [term_average] => 88                                [grades] => Array                                    (                                        [0] => Array                                            (                                                [jwc_grade_id] => 6                                                [course] => 是电风扇等                                                [point] => 2                                                [grade] => 1                                            )                                    )                            )                    )            )        [2] => Array            (                [2012] => Array                    (                        [2] => Array                            (                                [term_point] => 3.5                                [term_average] => 88                                [grades] => Array                                    (                                        [0] => Array                                            (                                                [jwc_grade_id] => 7                                                [course] => 不错                                                [point] => 2                                                [grade] => 1                                            )                                    )                            )                    )            )</code>

<code>                [2012] => Array                    (                        [1] => Array                            (                                [term_point] => 3.5                                [term_average] => 88                                [grades] => Array                                    (                                        [0] => Array                                            (                                                [jwc_grade_id] => 5                                                [course] => 阿什顿                                                [point] => 2                                                [grade] => 1                                            )                                    )                            )                    )                [2012] => Array                    (                        [1] => Array                            (                                [term_point] => 3.5                                [term_average] => 88                                [grades] => Array                                    (                                        [0] => Array                                            (                                                [jwc_grade_id] => 6                                                [course] => 是电风扇等                                                [point] => 2                                                [grade] => 1                                            )                                    )                            )                    )                 [2012] => Array                    (                        [2] => Array                            (                                [term_point] => 3.5                                [term_average] => 88                                [grades] => Array                                    (                                        [0] => Array                                            (                                                [jwc_grade_id] => 7                                                [course] => 不错                                                [point] => 2                                                [grade] => 1                                            )                                    )                            )                    )</code>