ZEND: Merge multiple xml configs for Zend_Navigation

If are using Zend_Navigation and wish to use mutliple xml Zend_Config_Xml files to build your Navigation object then it is possible to merge xml configuration files using Zend_Config::merge and pass the resulting object into Zend_Navigation. (e.g if a module/plugin wishes to append further navigation elements into your main navigation.xml)

The following example will merge two different xml config files and pass the resulting config to Zend_Navigation

//Make an empty Zend_Config object
$config = new Zend_Config( array(), true);

//Merge 1st xml file  (navigation.xml)
$config->merge( 
    new Zend_Config_Xml(
        APPLICATION_PATH . '/configs/navigation.xml', 
        'nav'
    )
);

//Merge 2nd xml file (navigation2.xml)
$config->merge( 
    new Zend_Config_Xml(
        APPLICATION_PATH . '/configs/navigation2.xml', 
        'nav'
    )
);

//Pass the resulting config to Zend_Navigation
$navigation = new Zend_Navigation($config);