PHP XML Library：一个不错的PHP XML操作类

今天在PHP4环境下重新写一个接口程序，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：

 

<?phpinclude('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 '<pre>';print_r($data);echo '</pre>';?>

data.xml文件：

view plaincopy to clipboardprint?

 

<?xml version="1.0" encoding="GBK"?><video><upload><videoid>998</videoid><name><![CDATA[回忆未来]]></name><memo><![CDATA[def]]></memo><up_userid>11317</up_userid></upload></video>

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：

view plaincopy to clipboardprint?

 

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

 

二、PHP XML操作类源代码：

1. <?php    
2. ###################################################################################    
3. #    
4. # XML Library, by Keith Devens, version 1.2b    
5. # <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a>    
6. #    
7. # This code is Open Source, released under terms similar to the Artistic License.    
8. # Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a>    
9. #    
10. ###################################################################################    
11.   
12. ###################################################################################    
13. # XML_unserialize: takes raw XML as a parameter (a string)    
14. # and returns an equivalent PHP data structure    
15. ###################################################################################    
16. function & XML_unserialize(&$xml){    
17.     $xml_parser = &new XML();    
18.     $data = &$xml_parser->parse($xml);    
19.     $xml_parser->destruct();    
20.     return $data;    
21. }    
22. ###################################################################################    
23. # XML_serialize: serializes any PHP data structure into XML    
24. # Takes one parameter: the data to serialize. Must be an array.    
25. ###################################################################################    
26. function & XML_serialize(&$data, $level = 0, $prior_key = NULL){    
27.     if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"/n"; }    
28.     while(list($key, $value) = each($data))    
29.         if(!strpos($key, ' attr')) #if it's not an attribute   
30.             #we don't treat attributes by themselves, so for an emptyempty element    
31.             # that has attributes you still need to set the element to NULL    
32.   
33.             if(is_array($value) and array_key_exists(0, $value)){    
34.                 XML_serialize($value, $level, $key);    
35.             }else{    
36.                 $tag = $prior_key ? $prior_key : $key;    
37.                 echo str_repeat("/t", $level),'<',$tag;    
38.                 if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element   
39.                     while(list($attr_name, $attr_value) = each($data["$key attr"]))   
40.                         echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"';   
41.                     reset($data["$key attr"]);   
42.                 }   
43.  
44.                 if(is_null($value)) echo " />/n";   
45.                 elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>/n";   
46.                 else echo ">/n",XML_serialize($value, $level+1),str_repeat("/t", $level),"</$tag>/n";   
47.             }   
48.     reset($data);   
49.     if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; }   
50. }   
51. ###################################################################################   
52. # XML class: utility class to be used with PHP's XML handling functions    
53. ###################################################################################    
54. class XML{    
55.     var $parser;   #a reference to the XML parser    
56.     var $document; #the entire XML structure built up so far    
57.     var $parent;   #a pointer to the current parent - the parent will be an array    
58.     var $stack;    #a stack of the most recent parent at each nesting level    
59.     var $last_opened_tag; #keeps track of the last tag opened.    
60.   
61.     function XML(){    
62.          $this->parser = &xml_parser_create();    
63.         xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false);    
64.         xml_set_object(&$this->parser, &$this);    
65.         xml_set_element_handler(&$this->parser, 'open','close');    
66.         xml_set_character_data_handler(&$this->parser, 'data');    
67.     }    
68.     function destruct(){ xml_parser_free(&$this->parser); }    
69.     function & parse(&$data){    
70.         $this->document = array();    
71.         $this->stack    = array();    
72.         $this->parent   = &$this->document;    
73.         return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL;    
74.     }    
75.     function open(&$parser, $tag, $attributes){    
76.         $this->data = ''; #stores temporary cdata    
77.         $this->last_opened_tag = $tag;    
78.         if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before   
79.             if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric   
80.                 #this is the third or later instance of $tag we've come across    
81.                 $key = count_numeric_items($this->parent[$tag]);    
82.             }else{    
83.                 #this is the second instance of $tag that we've seen. shift around   
84.                 if(array_key_exists("$tag attr",$this->parent)){   
85.                     $arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]);   
86.                     unset($this->parent["$tag attr"]);   
87.                 }else{   
88.                     $arr = array(&$this->parent[$tag]);   
89.                 }   
90.                 $this->parent[$tag] = &$arr;   
91.                 $key = 1;   
92.             }   
93.             $this->parent = &$this->parent[$tag];   
94.         }else{   
95.             $key = $tag;   
96.         }   
97.         if($attributes) $this->parent["$key attr"] = $attributes;   
98.         $this->parent  = &$this->parent[$key];   
99.         $this->stack[] = &$this->parent;   
100.     }   
101.     function data(&$parser, $data){   
102.         if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags    
103.             $this->data .= $data;    
104.     }    
105.     function close(&$parser, $tag){    
106.         if($this->last_opened_tag == $tag){    
107.             $this->parent = $this->data;    
108.             $this->last_opened_tag = NULL;    
109.         }    
110.         array_pop($this->stack);    
111.         if($this->stack) $this->parent = &$this->stack[count($this->stack)-1];    
112.     }    
113. }    
114. function count_numeric_items(&$array){    
115.     return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0;    
116. }    
117. ?>    

<?php ################################################################################### # # XML Library, by Keith Devens, version 1.2b # <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a> # # This code is Open Source, released under terms similar to the Artistic License. # Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a> # ################################################################################### ################################################################################### # XML_unserialize: takes raw XML as a parameter (a string) # and returns an equivalent PHP data structure ################################################################################### function & XML_unserialize(&$xml){    $xml_parser = &new XML();    $data = &$xml_parser->parse($xml);    $xml_parser->destruct();    return $data; } ################################################################################### # XML_serialize: serializes any PHP data structure into XML # Takes one parameter: the data to serialize. Must be an array. ################################################################################### function & XML_serialize(&$data, $level = 0, $prior_key = NULL){    if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"/n"; }    while(list($key, $value) = each($data))        if(!strpos($key, ' attr')) #if it's not an attribute            #we don't treat attributes by themselves, so for an empty element            # that has attributes you still need to set the element to NULL            if(is_array($value) and array_key_exists(0, $value)){                XML_serialize($value, $level, $key);            }else{                $tag = $prior_key ? $prior_key : $key;                echo str_repeat("/t", $level),'<',$tag;                if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element                    while(list($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),"</$tag>/n";                else echo ">/n",XML_serialize($value, $level+1),str_repeat("/t", $level),"</$tag>/n";            }    reset($data);    if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; } } ################################################################################### # XML class: utility class to be used with PHP's XML handling functions ################################################################################### class XML{    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 an array    var $stack;    #a stack of the most recent parent at each nesting level    var $last_opened_tag; #keeps track of the last tag opened.    function XML(){         $this->parser = &xml_parser_create();        xml_parser_set_option(&$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');    }    function destruct(){ xml_parser_free(&$this->parser); }    function & parse(&$data){        $this->document = array();        $this->stack    = array();        $this->parent   = &$this->document;        return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL;    }    function open(&$parser, $tag, $attributes){        $this->data = ''; #stores temporary cdata        $this->last_opened_tag = $tag;        if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before            if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric                #this is the third or later instance of $tag we've come across                $key = count_numeric_items($this->parent[$tag]);            }else{                #this is the second instance of $tag that we've seen. shift around                if(array_key_exists("$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;    }    function data(&$parser, $data){        if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags            $this->data .= $data;    }    function close(&$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($this->stack)-1];    } } function count_numeric_items(&$array){    return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0; } ?>

 

 

一个数组转xml字符串函数

 

/***************************************************
* 数组转xml字符串格式
* @aurhor  liuniuyyou
* @version 2009-09-09
* @access  public
* @param  array  $data
* @return  string
***************************************************/
function array2xml($data) {
 $xml = '<?xml version="1.0" encoding="UTF-8"?>';
 foreach ($data as $tag => $tmp) { #
  if ($tag == "0")
   $xml .= '<conf type="' . $tmp["type"] . '" >';
  else {
   $single_start = '<' . $tag;
   $mult_start = '<' . $tag . '>';
   $single_end = '/>';
   $mult_end = '</' . $tag . '>';
   $head = $single_start;
   $end = $single_end;
   foreach ($tmp as $key => $attr) {
    if (!is_array($attr)) {
     $body .= ' ' . $key . '="' . $attr . '" ';
    } else {
     $head = $mult_start;
     $end = $mult_end;
     foreach ($attr as $value) {
      $body .= '<' . $key;
      foreach ($value as $chil_key => $chil_value) {
       $body .= ' ' . $chil_key . '="' . $chil_value . '" ';
      }
      $body .= ' />';
     }
    }
   }
   $xml .= $head . $body . $end;
   unset ($head, $body, $end);
  }
 }
 $xml .= '</conf>';
 return $xml;
}