PHP xml_set_element_handler() Function

xml_set_element_handler(parser,start,end)

<?php
$parser=xml_parser_create();

function start($parser,$element_name,$element_attrs)
  {
  switch($element_name)
    {
    case "NOTE":
    echo "-- Note --<br />";
    break;
    case "TO":
    echo "To: ";
    break;
    case "FROM":
    echo "From: ";
    break;
    case "HEADING":
    echo "Heading: ";
    break;
    case "BODY":
    echo "Message: ";
    }
  }

function stop($parser,$element_name)
  {
  echo "<br />";
  }

function char($parser,$data)
  {
  echo $data;
  }

xml_set_element_handler($parser,"start","stop");
xml_set_character_data_handler($parser,"char");
$fp=fopen("test.xml","r");

while ($data=fread($fp,4096))
  {
  xml_parse($parser,$data,feof($fp)) or
  die (sprintf("XML Error: %s at line %d",
  xml_error_string(xml_get_error_code($parser)),
  xml_get_current_line_number($parser)));
  }

xml_parser_free($parser);
?>

-- Note --
To: Tove
From: Jani
Heading: Reminder
Message: Don't forget me this weekend!