Output data from php to ExtJs?

Question

PHP

Hello.
Hello.
Only recently 'met' with ExtJs. In version 4.2.1, I found the 'custom-form' example I needed.
Now you need to transfer your data that is in the database to the form.
Started 'watching' the file custom-form.js

Ext.Loader.setConfig({enabled: true});
Ext.Loader.setPath('Ext.ux', '../ux');
Ext.require([
    'Ext.data.*',
    'Ext.panel.Panel',
    'Ext.view.View',
    'Ext.layout.container.Fit',
    'Ext.toolbar.Paging',
    'Ext.ux.form.SearchField',
    'Ext.ux.DataTip'
]);

Ext.define('Post', {
    extend: 'Ext.data.Model',
    idProperty: 'post_id',
    fields: [
        {name: 'postId', mapping: 'post_id'},
        {name: 'title', mapping: 'topic_title'},
        {name: 'topicId', mapping: 'topic_id'},
        {name: 'author', mapping: 'author'},
        {name: 'lastPost', mapping: 'post_time', type: 'date', dateFormat: 'timestamp'},
        {name: 'excerpt', mapping: 'post_text'}
    ]
});

Ext.onReady(function(){
    
    var forumId = 4;

    var store = Ext.create('Ext.data.Store', {
        model: 'Post',
        proxy: {
            type: 'jsonp',
            url: 'http://sencha.com/forum/topics-remote.php',
            extraParams: {
                forumId: forumId
            },
            reader: {
                type: 'json',
                root: 'topics',
                totalProperty: 'totalCount'
            }
        },
        listeners: {
            beforeload: function(){
                var params = store.getProxy().extraParams;
                if (params.query) {
                    delete params.forumId;
                } else {
                    params.forumId = forumId;
                }
            }
        }
    });
    store.loadPage(1);

    var resultTpl = Ext.create('Ext.XTemplate',
        '<tpl for=".">',
        '<div class="search-item">',
            '<h3><span>{lastPost:this.formatDate}<br>by {author}</span>',
            '<a href="http://sencha.com/forum/showthread.php?t={topicId}&p={postId}" target="_blank">{title}</a></h3>',
            '<p>{excerpt}</p>',
        '</div></tpl>',
    {
        formatDate: function(value){
            return Ext.Date.format(value, 'M j, Y');
        }
    });

    var panel = Ext.create('Ext.panel.Panel', {
        title: 'Forum Search',
        height: 300,
        width: 600,
        renderTo: 'search-panel',
        id: 'search-results',
        layout: 'fit',
        items: {
            overflowY: 'auto',
            xtype: 'dataview',
            tpl: resultTpl,
            store: store,
            itemSelector: 'div.search-item',
            emptyText: '<div class="x-grid-empty">No Matching Threads</div>'
        },
        dockedItems: [{
            dock: 'top',
            xtype: 'toolbar',
            items: {
                width: 400,
                fieldLabel: 'Search',
                labelWidth: 50,
                xtype: 'searchfield',
                store: store
            }
        }, {
            dock: 'bottom',
            xtype: 'pagingtoolbar',
            store: store,
            pageSize: 25,
            displayInfo: true,
            displayMsg: 'Topics {0} - {1} of {2}',
            emptyMsg: 'No topics to display'
        }]
    });
});

Is there an example topics-remote.php file or approximate code to see how data is stored or retrieved from the database, which is then displayed.
Thanks in advance.