Ext.Ajax.request问题求助

前台代码如下：function saveEdit()
{
var store = grid1.getStore();
var modified = store.modified.slice(0);
var jsonArray = [];
Ext.each(modified,function(m){
//alert(m.data.pod_part);
jsonArray.push(m.data);
});
Ext.Ajax.request({
method:'POST',
url:'index.php?model=vnpl&action=podSave&',
params: {data:Ext.util.JSON.encode(jsonArray)},
success:function(response,config){
Ext.Msg.alert('提交成功',response.responseText);
}
});
}后台代码：    function actionPodSave()
    {
     $info = $_POST;
     var_dump($info);
    }前台返回值如下：
array(1) { ["data"]=> string(547) "[{\"pod_nbr\":\"NC110943\",\"pod_part\":\"LT-418-000074\",\"pt_desc\":\"AWG22,UL1007 STRAND WHT80C\",\"pod_qty_ord\":\"4270.0000\",\"pend_qty\":\"4270.0000\",\"pod_due_date\":\"2011-06-03\",\"pod__dte01\":\"2011-06-14T00:00:00\",\"pod__chr02\":\"月月月月月月白白白\"},{\"pod_nbr\":\"NC110943\",\"pod_part\":\"LT-418-000092\",\"pt_desc\":\"AWG22 UL1007 80C STRANDSBLACK\",\"pod_qty_ord\":\"4270.0000\",\"pend_qty\":\"4270.0000\",\"pod_due_date\":\"2011-06-03\",\"pod__dte01\":\"2011-06-14T00:00:00\",\"pod__chr02\":\"众人众人众人\"}]" } 
我在后台怎么将这个字符串格式化成JSON的格式？？大虾们求助