我有一个数组Array
(
    [P1211007] => 2
    [P1211008] => 3
 )
目前有2行数据,可能多少行未定.我要把这个数据标准化成这样的数据
Array
(
    [1] => Array
        (
            [P1211007] => Array
                (
                    [pcode] => P1211007
                    [book_num] => 2                    
                )            [P1211008] => Array
                (
                    [pcode] => P1211008
                    [book_num] => 3                    
                )
        )
)本人PHP是菜鸟,各位朋友帮忙.