El uso de Zend_Json consiste en utilizar los dos métodos públicos estáticos disponibles: Zend_Json::encode() y Zend_Json::decode() . Sometimes, it may be hard to explore JSON data generated by Zend_Json::encode() , since it has no spacing or indentation. In order to make it easier, Zend_Json allows you to pretty-print JSON data in the human-readable format with Zend_Json::prettyPrint() . " ")); } ]]> Second optional argument of Zend_Json::prettyPrint() is an option array. Option indent allows to set indentation string - by default it's a single tab character.