I have a form with 3 editable grids, i want to submit the Ext.data.Store into .php file. What should i do? here is the code

[PHP]Ext.onReady(function()
{

function formatDate(value){
return value ? value.dateFormat('M d, Y') : '';
}
;
var fm = Ext.form;
sm = new Ext.grid.RowSelectionModel();
var cm = new Ext.grid.ColumnModel([{
id:'chname',
header: "