Re: callbacks to methods inside a class/object

Hi, Wednesday, September 18, 2002, 7:15:36 AM, you wrote: DM> Is there a "clean" way to make use of PHP builtins that use callbacks and DM> point those call backs to a method inside the class/object: DM> A good example would be: DM> ... DM> class XMLClass { DM> var $parser; DM> function XMLClass() { DM> $this->parser = xml_parser_create(); DM> xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, TRUE); DM> xml_set_element_handler($this->parser, "$this->start", DM> "$this->end"); DM> xml_set_character_data_handler($this->parser, "$this->data"); DM> } DM> function goodbye() { // a manual destructor DM> xml_parser_free($this->parser); DM> // other things possibly too DM> } DM> function start($p2, $name, $attr) { DM> // do things here DM> } DM> function data($p2, $data) { DM> // do some more here DM> } DM> function end($p2, $name) { DM> // do even more things here DM> } DM> [... and so on ...] DM> ... DM> But since there is no way to set a callback to "$this->[function_name]" one DM> must create a global function that uses a global object and passes things to DM> the method inside the class.. DM> Is the a way to address this? or perhaps a better way to deal with callback DM> function names? DM> --Douglas Marsh Here is a skeleton of a parser class, note the uses of '&' to avoid generating copies of the object: class xml_parser { var $xml_parser; // constructor function xml_parser() { $this->xml_parser = xml_parser_create(); xml_set_element_handler($this->xml_parser, array(&$this,"start_element"),array(&$this,"end_element")); xml_set_character_data_handler($this->xml_parser,array(&$this,"character_data")); } function character_data($parser, $data) { } function start_element($parser, $name, $attrs) { } function end_element($parser, $name) { } function parse() { } } //usage $xml =& new xml_parser(); -- regards, Tom