PHP：在没有JSON的数据库中保存2d数组

I send this values to a PHP script which saves the rowData Value to a database. This are the POST Parameters:

amount  1
ident   1
orderID 101447
rowData [["0","","","","",""],["0","","","","",""],["0","","","","",""]]
storage 2

now I need a way to format a 2D Array in PHP to the same format like the rowData Parameter. Does anybody have some tips or a hint for me?

This is my JS Code:

$.ajax({
            type: "POST",
            url: "http://127.0.0.1/some/dir/file.php",
            data: {
                orderID: orderID,
                storage:storage,
                ident:ident,
                amount:amount,
                rowData:rowData//this is the 2D Array
            }