PHP从Controller返回值到Ajax

I am using a MVC and I have a button that is using an AJAX call to remove an uploaded image on the site.

This is my Model:

public function remove_document($documentID, $documentName)
    {
        $objData = $this->objDB
            -> setStoredProc('attritionRemoveDocument')
            -> setParam('documentID', $documentID)
            -> setParam('documentName', $documentName)
            -> execStoredProc()
            -> parseXML();

        return $objData->data->response;    

    }

The response back from this is either true or false.

Here is my controller:

public function deleteFile()
    {
        // Get the documentID we are removing
        $documentID = $this->input->post('documentID');
        $documentName = $this->input->post('documentName');

        // Check if the file is even there
        if (file_exists('./uploads/'.$documentName)){

            // Remove file
            unlink('./uploads/'.$documentName);
            $removeFile = $this->submit_model->remove_document($documentID, $documentName);

            return $removeFile;

         }

   }

And finally, my AJAX Call:

$('[name=deleteDocument]').click(function() {

        var documentID = $(this).attr('documentID'),
            documentName = $(this).attr('documentName');

        //Delete the image
        $.ajax({
            type: 'POST',
            url: '../deleteFile',
            dataType: 'xml',
            data: {
                'documentID': documentID,
                'documentName': documentName
            },
            success: function(msg) {

                // On Success, remove the current file section
                console.log(msg);

            }

        });

    });

When i echo the $removeFile value in the controller, I see the true/false value however it never makes it to the success function of the AJAX call.

Any ideas?

in Controller

if the result is true

echo "OK"

if the result is false

echo "NO"

in your View and in success part

success: function(msg) {

  if(msg=="OK"){

    alert("DELETED");

   }else{
    alert("NOT deleted");
   }

Your controller should not return BOOL if you are using it with ajax , Your AJAX call , should control the result by success method .