How can the xml_set_element_handler function be properly utilized in PHP to call class methods as callback handlers?

To properly utilize the xml_set_element_handler function in PHP to call class methods as callback handlers, you need to pass an object instance along with the method name when setting the handler. This can be achieved by using an array where the first element is the object instance and the second element is the method name. This way, the method will be called within the context of the object instance.

class XMLHandler {
    public function startElement($parser, $name, $attrs) {
        // Handle start element
    }

    public function endElement($parser, $name) {
        // Handle end element
    }
}

$xmlHandler = new XMLHandler();

$xmlParser = xml_parser_create();
xml_set_element_handler($xmlParser, array($xmlHandler, 'startElement'), array($xmlHandler, 'endElement'));

// Parse XML data
xml_parse($xmlParser, $xmlData);

// Free the parser
xml_parser_free($xmlParser);