PHP tags::writeDOM示例

function category_load($id, $param=array()) {
  global $db_central;
  $db=null;

  // Postgre-Escape id
  $pg_id=postgre_escape($id);

  // if requesting newest version use central database
  if(isset($param['version'])&&($param['version']=="newest")) {
    $db=$db_central;
  }

  // if no version supplied, return current version
  if(isset($param['version'])&&($param['version']!="newest")) {
    $version=$param['version'];
  }
  else {
    $res=sql_query("select * from category_current where category_id=$pg_id", $db);
    if(!$elem=pg_fetch_assoc($res)) {
      return array('status'=>"'$id': No such category");
    }
    else {
      $version=$elem['version'];
    }
  }

  // Postgre-Escape version
  $pg_version=postgre_escape($version);

  // Get root of category
  $res=sql_query("select * from category where version=$pg_version", $db);
  if(!$elem=pg_fetch_assoc($res)) {
    return array('status'=>"'$id/$version': No such category/version");
  }

  $res=sql_query("select * from category_current where category_id='$id'", $db_central);
  $newest=pg_fetch_assoc($res);

  // Prepare returning XML
  $dom=new DOMDocument();
  $root=$dom->createElement("category");
  $dom->appendChild($root);
  $root->setAttribute("id", $id);
  $root->setAttribute("version", $version);
  if($newest)
    $root->setAttribute("newest_version", $newest['version']);

  // process Tags
  $tags=new tags(parse_hstore($elem['tags']));
  $tags->writeDOM($root, $dom);

  // check if there's important stuff in version tags
  $version_tags=parse_hstore($elem['version_tags']);
  if($version_tags['lock']=="yes")
    $root->setAttribute("lock", "yes");

  // Now process the rules
  $res=sql_query("select * from category_rule where version=$pg_version", $db);
  while($elem=pg_fetch_assoc($res)) {
    // base
    $rule=$dom->createElement("rule");
    $rule->setAttribute("id", $elem['rule_id']);
    $root->appendChild($rule);

    // tags
    $tags=new tags(parse_hstore($elem['tags']));
    $tags->writeDOM($rule, $dom);
  }

  // we are done!
  return $dom->saveXML();
}