PHP xml_set_unparsed_entity_decl_handler() Function

xml_set_unparsed_entity_decl_handler(parser,handler)

<?php $parser=xml_parser_create();

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

function unparsed_ent_handler($parser,$entname,
$base,$sysID,$pubID,$notname)
  {
  print "$entname<br />";
  print "$sysID<br />";
  print "$pubID<br />";
  print "$notname<br />";
  }

xml_set_character_data_handler($parser,"char");
xml_set_unparsed_entity_decl_handler($parser,
"unparsed_ent_handler");

$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);
?>