PHP XML Library：一个不错的PHP XML操作类 （接上）

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PHP XML Library：一个不错的PHP XML操作类 （接上）..

1. ###################################################################################
   
2. #
   
3. # XML Library, by Keith Devens, version 1.2b
   
4. # <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a>
   
5. #
   
6. # This code is Open Source, released under terms similar to the Artistic License.
   
7. # Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a>
   
8. #
   
9. ###################################################################################
   
10. 
    
11. ###################################################################################
    
12. # XML_unserialize: takes raw XML as a parameter (a string)
    
13. # and returns an equivalent PHP data structure
    
14. ###################################################################################
    
15. function & XML_unserialize(&$xml){
    
16.     $xml_parser = &new XML();
    
17.     $data = &$xml_parser->parse($xml);
    
18.     $xml_parser->destruct();
    
19.     return $data;
    
20. }
    
21. ###################################################################################
    
22. # XML_serialize: serializes any PHP data structure into XML
    
23. # Takes one parameter: the data to serialize. Must be an array.
    
24. ###################################################################################
    
25. function & XML_serialize(&$data, $level = 0, $prior_key = NULL){
    
26.     if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; }
    
27.     while(list($key, $value) = each($data))
    
28.         if(!strpos($key, ' attr')) #if it's not an attribute
    
29.             #we don't treat attributes by themselves, so for an empty element
    
30.             # that has attributes you still need to set the element to NULL
    
31. 
    
32.             if(is_array($value) and array_key_exists(0, $value)){
    
33.                 XML_serialize($value, $level, $key);
    
34.             }else{
    
35.                 $tag = $prior_key ? $prior_key : $key;
    
36.                 echo str_repeat("\t", $level),'<',$tag;
    
37.                 if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element
    
38.                     while(list($attr_name, $attr_value) = each($data["$key attr"]))
    
39.                         echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"';
    
40.                     reset($data["$key attr"]);
    
41.                 }
    
42. 
    
43.                 if(is_null($value)) echo " />\n";
    
44.                 elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n";
    
45.                 else echo ">\n",XML_serialize($value, $level+1),str_repeat("\t", $level),"</$tag>\n";
    
46.             }
    
47.     reset($data);
    
48.     if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; }
    
49. }
    
50. ###################################################################################
    
51. # XML class: utility class to be used with PHP's XML handling functions
    
52. ###################################################################################
    
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. ?>

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