php DOMDocument removeChild 删除节点函数

function loadfile($file){
  $newfile=new domdocument();
  $newfile->validateonparse=true;
  $newfile->load($file);
 
  return $newfile;
}
function add($file, $parentname, $children){ //增加xml节点
  $xml=loadfile($file);
 
  $id=uniqid('m' . rand(1,5), true);
  $parentnode=$xml->createelement($parentname);
  $parentnode->setattribute('mid', $id);
  foreach($children as $child => $value){
    $childnode=$xml->createelement($child, $value);
    $parentnode->appendchild($childnode);
  }
  $xml->documentelement->appendchild($parentnode);
  $xml->save($file);
  return $id;
}
function delete($file, $id){//删除xml 节点
  $xml=loadfile($file);
  $ids=explode(",", $id);
  foreach ($ids as $oldnodeid){
    $oldnode=$xml->getelementbyid($oldnodeid);
    $parentnode=$oldnode->parentnode;
    $parentnode->removechild($oldnode);
  }
  $xml->save($file);
}
function edit($file, $id, $child, $value){//编辑xml 节点
  $xml=loadfile($file);
 
  $parentnode=$xml->getelementbyid($id);
  $childnode=$parentnode->childnodes->item($child);
  $textnode=$childnode->childnodes->item(0);
  $textnode->nodevalue=$value;
 
  $xml->save($file);
}
function move($file, $moveid, $refid=null){ //移动xml节点
  $xml=loadfile($file);
 
  $movenode=$xml->getelementbyid($moveid);
  $parentnode=$movenode->parentnode;
  if ($refid!=null) {
    $refnode=$xml->getelementbyid($refid);
    if(!$parentnode->issamenode($refnode->parentnode)) return false;
  }
  else $refnode=null;
  $movenode=$parentnode->removechild($movenode);
  $parentnode->insertbefore($movenode,$refnode);
 
  $xml->save($file);
}

$xml = < < < xml 
<?xml version = "1.0" ?>  
  <misc_command version="1.5">  
  <command_name>provision </command_name>  
  <command_data_block>  
  <action_id>1 </action_id>  
  <service_id>01112233 </service_id>  
  <mid>00148888888888 </mid>  
  <mobile_id>www.111cn.net </mobile_id>  
  <access_mode>1 </access_mode>  
  <access_mode>2 </access_mode>  
  <access_mode>3 </access_mode>  
  </command_data_block>  
  </misc_command>  
xml; 
$x = simplexml_load_string($xml); 
//$x = simplexml_load_string(file_get_content(url)); 
print_r($x); 

out: 
simplexmlelement object 
( 
  [@attributes] => array 
  ( 
  [version] => 1.5 
  ) 

  [command_name] => provision 
  [command_data_block] => simplexmlelement object 
  ( 
  [action_id] => 1 
  [service_id] => 01112233 
  [mid] => 00148888888888 
  [mobile_id] => 13999998888 
  [access_mode] => array 
  ( 
  [0] => 1 
  [1] => 2 
  [2] => 3 
  ) 

  ) 

) 

调用方法
$array =  xml2array(file_get_contents('feed.xml', 1, 'attribute'));
*/
function xml2array($contents, $get_attributes=1, $priority = 'tag') {
    if(!$contents) return array();

    if(!function_exists('xml_parser_create')) {
        //print "'xml_parser_create()' function not found!";
        return array();
    }

    //get the xml parser of php教程 - php must have this module for the parser to work
    $parser = xml_parser_create('');
    xml_parser_set_option($parser, xml_option_target_encoding, "utf-8"); # http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
    xml_parser_set_option($parser, xml_option_case_folding, 0);
    xml_parser_set_option($parser, xml_option_skip_white, 1);
    xml_parse_into_struct($parser, trim($contents), $xml_values);
    xml_parser_free($parser);

    if(!$xml_values) return;//hmm...

    //initializations
    $xml_array = array();
    $parents = array();
    $opened_tags = array();
    $arr = array();

    $current = &$xml_array; //refference

    //go through the tags.
    $repeated_tag_index = array();//multiple tags with same name will be turned into an array
    foreach($xml_values as $data) {
        unset($attributes,$value);//remove existing values, or there will be trouble

        //this command will extract these variables into the foreach scope
        // tag(string), type(string), level(int), attributes(array).
        extract($data);//we could use the array by itself, but this cooler.

        $result = array();
        $attributes_data = array();

        if(isset($value)) {
            if($priority == 'tag') $result = $value;
            else $result['value'] = $value; //put the value in a assoc array if we are in the 'attribute' mode
        }

        //set the attributes too.
        if(isset($attributes) and $get_attributes) {
            foreach($attributes as $attr => $val) {
                if($priority == 'tag') $attributes_data[$attr] = $val;
                else $result['attr'][$attr] = $val; //set all the attributes in a array called 'attr'
            }
        }

        //see tag status and do the needed.
        if($type == "open") {//the starting of the tag '<tag>'
            $parent[$level-1] = &$current;
            if(!is_array($current) or (!in_array($tag, array_keys($current)))) { //insert new tag
                $current[$tag] = $result;
                if($attributes_data) $current[$tag. '_attr'] = $attributes_data;
                $repeated_tag_index[$tag.'_'.$level] = 1;

                $current = &$current[$tag];

            } else { //there was another element with the same tag name

                if(isset($current[$tag][0])) {//if there is a 0th element it is already an array
                    $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
                    $repeated_tag_index[$tag.'_'.$level]++;
                } else {//this section will make the value an array if multiple tags with the same name appear together
                    $current[$tag] = array($current[$tag],$result);//this will combine the existing item and the new item together to make an array
                    $repeated_tag_index[$tag.'_'.$level] = 2;

                    if(isset($current[$tag.'_attr'])) { //the attribute of the last(0th) tag must be moved as well
                        $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                        unset($current[$tag.'_attr']);
                    }

                }
                $last_item_index = $repeated_tag_index[$tag.'_'.$level]-1;
                $current = &$current[$tag][$last_item_index];
            }

        } elseif($type == "complete") { //tags that ends in 1 line '<tag />'
            //see if the key is already taken.
            if(!isset($current[$tag])) { //new key
                $current[$tag] = $result;
                $repeated_tag_index[$tag.'_'.$level] = 1;
                if($priority == 'tag' and $attributes_data) $current[$tag. '_attr'] = $attributes_data;

            } else { //if taken, put all things inside a list(array)
                if(isset($current[$tag][0]) and is_array($current[$tag])) {//if it is already an array...

                    // ...push the new element into that array.
                    $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;

                    if($priority == 'tag' and $get_attributes and $attributes_data) {
                        $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                    }
                    $repeated_tag_index[$tag.'_'.$level]++;

                } else { //if it is not an array...
                    $current[$tag] = array($current[$tag],$result); //...make it an array using using the existing value and the new value
                    $repeated_tag_index[$tag.'_'.$level] = 1;
                    if($priority == 'tag' and $get_attributes) {
                        if(isset($current[$tag.'_attr'])) { //the attribute of the last(0th) tag must be moved as well

                            $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                            unset($current[$tag.'_attr']);
                        }

                        if($attributes_data) {
                            $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                        }
                    }
                    $repeated_tag_index[$tag.'_'.$level]++; //0 and 1 index is already taken
                }
            }

        } elseif($type == 'close') { //end of tag '</tag>'
            $current = &$parent[$level-1];
        }
    }

    return($xml_array);
}

#########################################################################################################

class parserxml
{
  function parserxml()
  {

  }
  function parserxmlbyurl($url)
  {
     $fp = @fopen($url,'r');
  if (!$fp){
    return 1;
  }
  $xmlstr = fread($fp,1024);
  @fclose($fp);
  if ($xmlstr === false){
    return 0;
  }
  return $this->getxmltree($xmlstr);
  }
  function getxmltree($xmldata)
  {
    ini_set ('track_errors', '1');
    $xmlreaderror = false;
    $parser = xml_parser_create();
    xml_parser_set_option ($parser, xml_option_skip_white, 1);
    xml_parser_set_option ($parser, xml_option_case_folding, 0);
    if (!xml_parse_into_struct ($parser, $xmldata, $vals, $index)) {
       $xmlreaderror = true;
       return 0;
    }
    xml_parser_free($parser);

    if(!$xmlreaderror){
       $result = array ();
       $i = 0;
       if (isset($vals[$i]['attributes'])){
           foreach (array_keys ($vals [$i]['attributes']) as $attkey)
           $attributes[$attkey] = $vals[$i]['attributes'][$attkey];
    }
       $result[$vals [$i]['tag']] = array_merge((array)$attributes, $this->getchildren($vals, $i, 'open'));
    }
    ini_set('track_errors', '0');
    return $result;
  }
  function getchildren ($vals, &$i, $type)
  {
    if ($type == 'complete') {
       if (isset ($vals [$i]['value']))
           return ($vals [$i]['value']);
       else
           return '';
  }
  $children = array ();
  while ($vals [++$i]['type'] != 'close') {
       $type = $vals [$i]['type'];
       if (isset ($children [$vals [$i]['tag']])) {
           if (is_array ($children [$vals [$i]['tag']])) {
               $temp = array_keys ($children [$vals [$i]['tag']]);
               if (is_string ($temp [0])) {
                   $a = $children [$vals [$i]['tag']];
                   unset ($children [$vals [$i]['tag']]);
                   $children [$vals [$i]['tag']][0] = $a;
               }
           } else {
               $a = $children [$vals [$i]['tag']];
               unset ($children [$vals [$i]['tag']]);
               $children [$vals [$i]['tag']][0] = $a;
           }

           $children [$vals [$i]['tag']][] = $this->getchildren ($vals, $i, $type);
       } else
           $children [$vals [$i]['tag']] = $this->getchildren ($vals, $i, $type);
       if (isset ($vals [$i]['attributes'])) {
           $attributes = array ();
           foreach (array_keys ($vals [$i]['attributes']) as $attkey)
           $attributes [$attkey] = $vals [$i]['attributes'][$attkey];
           if (isset ($children [$vals [$i]['tag']])) {
               if ($children [$vals [$i]['tag']] == '') {
                   unset ($children [$vals [$i]['tag']]);
                   $children [$vals [$i]['tag']] = $attributes;
               }
               elseif (is_array ($children [$vals [$i]['tag']])) {
                   $index = count ($children [$vals [$i]['tag']]) - 1;
                   if ($children [$vals [$i]['tag']][$index] == '') {
                       unset ($children [$vals [$i]['tag']][$index]);
                       $children [$vals [$i]['tag']][$index] = $attributes;
                   }
                   $children [$vals [$i]['tag']][$index] = array_merge ($children [$vals [$i]['tag']][$index], $attributes);
               } else {
                   $value = $children [$vals [$i]['tag']];
                   unset ($children [$vals [$i]['tag']]);
                   $children [$vals [$i]['tag']]['value'] = $value;
                   $children [$vals [$i]['tag']] = array_merge ($children [$vals [$i]['tag']], $attributes);
               }
           } else
               $children [$vals [$i]['tag']] = $attributes;
       }
  }
    return $children;

?>