Just adding a little note about my above written example. It needs some improvements.
Because PHP passes by VALUE by default, when you pass an array like this:
array($callback_handler, 'handler_method')
PHP makes a copy of the callback_handler object and uses the handler_method in the copy.
This is not an ideal situation for many reasons...which I will not get into here...but you should have an idea by now.
The best way to fix this is to change a few things. In the function declaration change the parameter from $callback_handler to &$callback_handler. So now your declaration should look like this
function set_callback_handler(&$callback_handler)
{
...
}
Now each time you reference $callback_handler change it to &$callback_handler. For example:
xml_set_element_handler(
$this->xml_parser,
array(&$callback_handler, 'start_element'),
array(&$callback_handler, 'close_Element' ));
This ensures that PHP will always use the same object.
