从Ajax传递和处理2D数组到Php

I passing an array from Jquery(post) to php like:

[["a","b","c"],["aa:","bb","cc"]]  

How to extract this array in php?
My code is:

UPDATE

 $data = json_decode($_POST['data']);
 print_r($data);

This code return :

Array
(
    [0] => Array
        (
            [0] => as
            [1] => as
            [2] => 
        )

    [1] => Array
        (
            [0] => asas :
            [1] => as
            [2] => text
        )

)

Instead of passing an array. You can tackle this two different ways

1) encode everything in JSON and pass it to php.

2) take everything that you need from the form and serialize it. Then explode the serialized data in your language of choice.

Passing arrays will not work the way you think it will. So it's best to just serialize the data and then do what you need. Using loops is a waste of time and CPU resources that could slow down the users experience.