PHP中XML操作类XML Library的实现

作者：袖梨 2022-06-24

本文实例讲述了PHP实现的XML操作类。分享给大家供大家参考，具体如下：

这是一个接口程序，需要大量分析解析XML，PHP的xml_parse_into_struct()函数不能直接生成便于使用的数组，而SimpleXML扩展在PHP5中才支持，于是逛逛搜索引擎，在老外的网站上找到了一个不错的PHP XML操作类。

一、用法举例：

1、将XML文件解释成便于使用的数组：

include('xml.php');//引用PHP XML操作类
$xml=file_get_contents('data.xml');//读取XML文件
//$xml = file_get_contents("php://input"); //读取POST过来的输入流
$data=XML_unserialize($xml);
echo'
';
print_r($data);
echo'';
?>

data.xml文件：

998
11317

利用该XML操作类生成的对应数组（汉字编码：UTF-8）：

Array
(
 [video] => Array
  (
   [upload] => Array
    (
     [videoid] => 998
     [name] => 回忆未来
     [memo] => def
     [up_userid] => 11317
    )
  )
)

2、将数组转换成XML文件：

include('xml.php');//引用PHP XML操作类
$xml= XML_serialize($data);
?>

二、PHP XML操作类源代码：

###################################################################################
# XML_unserialize: takes raw XMLasa parameter (a string)
#andreturns an equivalent PHP data structure
###################################################################################
function& XML_unserialize(&$xml){
 $xml_parser= &newXML();
 $data= &$xml_parser->parse($xml);
 $xml_parser->destruct();
 return$data;
}
###################################################################################
# XML_serialize: serializes any PHP data structure into XML
# Takes one parameter: the data to serialize. Must be anarray.
###################################################################################
function& XML_serialize(&$data,$level= 0,$prior_key= NULL){
 if($level== 0){ ob_start();echo'',"n"; }
 while(list($key,$value) = each($data))
  if(!strpos($key,' attr')) #ifit's not an attribute
   #we don't treat attributes by themselves, soforan emptyempty element
   # that has attributes you still need to set the element to NULL
   if(is_array($value)andarray_key_exists(0,$value)){
    XML_serialize($value,$level,$key);
   }else{
    $tag=$prior_key?$prior_key:$key;
    echostr_repeat("t",$level),'<',$tag;
    if(array_key_exists("$key attr",$data)){ #ifthere's an attributeforthis element
     while(list($attr_name,$attr_value) = each($data["$key attr"]))
      echo' ',$attr_name,'="',htmlspecialchars($attr_value),'"';
     reset($data["$key attr"]);
    }
    if(is_null($value))echo" />n";
    elseif(!is_array($value))echo'>',htmlspecialchars($value),"n";
    elseecho">n",XML_serialize($value,$level+1),str_repeat("t",$level),"n";
   }
 reset($data);
 if($level== 0){$str= &ob_get_contents(); ob_end_clean();return$str; }
}
###################################################################################
# XMLclass: utilityclassto be used with PHP's XML handling functions
###################################################################################
classXML{
 var$parser; #a reference to the XML parser
 var$document; #the entire XML structure built up so far
 var$parent; #a pointer to the current parent - the parent will be anarray
 var$stack; #a stack of the most recent parent at each nesting level
 var$last_opened_tag; #keeps track of the last tag opened.
 functionXML(){
   $this->parser = &xml_parser_create();
  xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false);
  xml_set_object(&$this->parser, &$this);
  xml_set_element_handler(&$this->parser,'open','close');
  xml_set_character_data_handler(&$this->parser,'data');
 }
 functiondestruct(){ xml_parser_free(&$this->parser); }
 function& parse(&$data){
  $this->document =array();
  $this->stack =array();
  $this->parent = &$this->document;
  returnxml_parse(&$this->parser, &$data, true) ?$this->document : NULL;
 }
 functionopen(&$parser,$tag,$attributes){
  $this->data =''; #stores temporary cdata
  $this->last_opened_tag =$tag;
  if(is_array($this->parent)andarray_key_exists($tag,$this->parent)){ #ifyou've seen this tag before
   if(is_array($this->parent[$tag])andarray_key_exists(0,$this->parent[$tag])){ #ifthe keys are numeric
    #this is the thirdorlater instance of$tagwe've come across
    $key= count_numeric_items($this->parent[$tag]);
   }else{
    #this is the second instance of$tagthat we've seen. shift around
    if(array_key_exists("$tag attr",$this->parent)){
     $arr=array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]);
     unset($this->parent["$tag attr"]);
    }else{
     $arr=array(&$this->parent[$tag]);
    }
    $this->parent[$tag] = &$arr;
    $key= 1;
   }
   $this->parent = &$this->parent[$tag];
  }else{
   $key=$tag;
  }
  if($attributes)$this->parent["$key attr"] =$attributes;
  $this->parent = &$this->parent[$key];
  $this->stack[] = &$this->parent;
 }
 functiondata(&$parser,$data){
  if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags
   $this->data .=$data;
 }
 functionclose(&$parser,$tag){
  if($this->last_opened_tag ==$tag){
   $this->parent =$this->data;
   $this->last_opened_tag = NULL;
  }
  array_pop($this->stack);
  if($this->stack)$this->parent = &$this->stack[count($this->stack)-1];
 }
}
functioncount_numeric_items(&$array){
 returnis_array($array) ?count(array_filter(array_keys($array),'is_numeric')) : 0;
}
?>

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