PHP json_encode encode a function

Viola i solved my problem with Zend_JSON encoder

 $options = array(
     'title' => 'Title',
     'fnCallback' => new Zend_Json_Expr('someCallback')
 );      

 Zend_Json::encode(
     $options,
     false,
     array('enableJsonExprFinder' => true));

JSON is for passing values around, they are not suitable for passing pieces of code.

You can, instead, pass a function name or other meaningful value and retrieve the right function to call from it on the JavaScript side.