title: how to work with sencha Php
body: <p>I am new in Sencha 
  i have created </p>
  
  <pre><code>var genres = new Ext.data.Store({   autoLoad: true, 
              proxy: {
                  url: '../www/App/stores/genres.php'
                  ,callbackKey: "callback"
                  , type:'ajax',
                   reader:{
                          type:'json',
                          root:'rows'
                   }, 
                   callback:function(data){
                   alert(data);}
              },
              fields:[{name:'ii',type: 'int'},{name:'genre_name',type:'string'   }]
              }); 
  </code></pre>
  
  <p>the php  file creates json file but i can't  access them if i create json file instead it works fine  what to do ? help</p>