thinkphp中想把資料庫中取出的資料 和利用count統計出的數字合并到一個數組中

thinkphpphp數組

 Array(    [0] => Array        (            [paper_id] => 2            [student] => 小丸子            [subject] => 資訊技術            [sj_title] => 資訊考試            [paper_createtime] => 2015-10-14 13:39:08        )    [1] => Array        (            [paper_id] => 2            [student] => 小丸子            [subject] => 資訊技術            [sj_title] => 資訊考試            [paper_createtime] => 2015-10-14 13:39:08        ))數組bArray(    [0] => Array        (            [num] => 2        )     [2] => Array        (            [num] => 1        ))    想要的結果：     Array(    [0] => Array        (            [paper_id] => 2            [student] => 小丸子            [subject] => 資訊技術            [sj_title] => 資訊考試            [paper_createtime] => 2015-10-14 13:39:08                        [num] => 2        )    [1] => Array        (            [paper_id] => 2            [student] => 小丸子            [subject] => 資訊技術            [sj_title] => 資訊考試            [paper_createtime] => 2015-10-14 13:39:08                        [num] => 1        ))

試了數組合并array_merge_recursive 和array_merge貌似都不行，應該如何?？

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