(PHP 4, PHP 5)
xml_set_default_handler — Set up default handler
   Sets the default handler function for the XML parser
   parser.
  
parserA reference to the XML parser to set up default handler function.
handler
       handler is a string containing the name of a
       function that must exist when xml_parse() is called
       for parser.
      
       The function named by handler must accept
       two parameters:
       
$parser
        , string $data
        )parser
         data
         data, contains
           the character data.This may be the XML declaration,
           document type declaration, entities or other data for which
           no other handler exists.
          
         
       If a handler function is set to an empty string, or FALSE, the handler
       in question is disabled.
      
Note: Instead of a function name, an array containing an object reference and a method name can also be supplied.
   Returns TRUE on success or FALSE on failure.