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    <p>Backbone expects JSON as the default response format. <strike>When you get an integer, i suspect, backbone is using jquery <code>$.parseJSON()</code> on the number and returns it as valid JSON while it is not.</strike> If you want to return multiple errors messages, i suggest you put them into separate fields of an array and encode them then send as response to backbone.</p> <h3>EDIT</h3> <p>Just checked backbone source code and it doesn't call on <code>$.parseJOSN()</code> contrary to what was guessed above.</p> <h3>EDIT 2</h3> <p>Assume you have the following PHP code (as much as I would like to create a framework agnostic example, it is possible but things will be quicker and smoother using a framework so I have picked <a href="http://www.slimframework.com/" rel="nofollow">Slim</a>).</p> <p>When you save a model, backbone sends the data to the server using POST as the method. In Slim this will translate into the following:</p> <pre><code>$app = new \Slim\Slim(); $app-&gt;post('/authors/', function() use($app) { // We get the request data from backbone in $request $request = $app-&gt;request()-&gt;getBody(); // We decode them into a PHP object $requestData = json_decode($request); // We put the response object in $response : this will allow us to set the response data like header values, etc $response = $app-&gt;response(); // You do all the awesome stuff here and get an array containing data in $data // // Sample $data in case of success $data = array( 'code' =&gt; 200, 'status' =&gt; 'OK', 'data' =&gt; array('id'=&gt;1, 'name' =&gt; 'John Doe') ); // sample $data in case of error $data = array( 'code' =&gt; 500, 'status' =&gt; 'Internal Server Error', 'message' =&gt; 'We were unable to reach the data server, please try again later' ); // Then you set the content type $app-&gt;contentType('application/json'); // Don't forget to add the HTTP code, Backbone.js will call "success" only if it has 2xx HTTP code $app-&gt;response()-&gt;status( $data['code']); // And finally send the data $response-&gt;write($data); </code></pre> <p>I have used Slim simply because it gets the job done and everything should read like English.</p> <p>As you can see, Backbone will need the response in JSON format. I just tested on one of my websites, if you send an HTTP code different from 2xx, Backbone will actually call <code>error</code> instead of <code>success</code>. But the browser will also catch that HTTP code, so watch out!</p> <p><strong>REMOVED INFO</strong></p> <p>Backbone <code>parse</code> function will be expecting JSON as well! Assume we have this collection:</p> <pre><code>var AuthorsCollection = Backbone.Collection.extend({ initialize: function( models, options ) { this.batch = options.batch }, url: function() { return '/authors/' + this.batch; }, // Parse here allows us to play with the response as long as "response" is a JSON object. Otherwise, Backbone will automatically call the "error" function on whatever, say view, is using this collection. parse: function( response ) { return response.data; } }); </code></pre> <p><code>parse</code> allows you to inspect the response, but will not accept anything else than JSON!</p>
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    1. COthe problem is when I use json_encode to any array, it will always go to success callback. even it is a json string. only regular string will fall to error
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    2. CO@eded Yes, backbone will call `error` only if it received the wrong format for the response. If it gets the proper response, it will go to `success`. Personally I use HTTP codes to determine if i have an error or a success and act on that. If backbone calls `error`, then i know whatever I sent was not JSON and my code is sending the wrong response. Think of `error` as a function that helps you debug the server response. Hope it has better use than that!
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    3. CO@ntbas thanks for explaining that. i will really appriciate if you can show me some sample code or any short examples
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