一个操作xml的PHP类（附实例）

gotophp

1. <?php
   
2. /**
   
3. * @copyright 互联网
   
4. * 整理：[url]www.phppx.com[/url]
   
5. * @desc 一个操作xml的PHP类
   
6. */
   
7. 
   
8. /*
   
9.    (c) 2000 Hans Anderson Corporation.  All Rights Reserved.
   
10.    You are free to use and modify this class under the same
    
11.    guidelines found in the PHP License.
    
12. 
    
13.    -----------
    
14. 
    
15.    bugs/me:
    
16.    [url]http://www.hansanderson.com/php/[/url]
    
17.    [email]me@hansanderson.com[/email]
    
18.    [email]showstv@163.com[/email]
    
19. 
    
20.    -----------
    
21. 
    
22.    Version 1.0
    
23. 
    
24.       - 1.0 is the first actual release of the class.  It"s  
    
25.        finally what I was hoping it would be, though there
    
26.        are likely to still be some bugs in it.  This is
    
27.        a much changed version, and if you have downloaded
    
28.        a previous version, this WON"T work with your existing
    
29.        scripts!  You"ll need to make some SIMPLE changes.
    
30. 
    
31.       - .92 fixed bug that didn"t include tag attributes
    
32. 
    
33.        (to use attributes, add _attributes[array_index]
    
34.         to the end of the tag in question:
    
35.         $xml_html_head_body_img would become
    
36.         $xml_html_head_body_img_attributes[0],  
    
37.         for example)
    
38. 
    
39.         -- Thanks to Nick Winfield <[email]nick@wirestation.co.uk[/email]>
    
40.           for reporting this bug.
    
41. 
    
42.       - .91 No Longer requires PHP4!
    
43. 
    
44.       - .91 now all elements are array.  Using objects has
    
45.        been discontinued.
    
46. */
    
47. 
    
48. class xml_container{
    
49. 
    
50.    function store($k,$v) {
    
51.       $this->{$k}[] = $v;
    
52.    }
    
53. }
    
54. 
    
55. 
    
56. /* parses the information */
    
57. /*********************************
    
58. *   类定义开始
    
59. *
    
60. *********************************/
    
61. class xml{
    
62.    
    
63.    // initialize some variables
    
64.    var $current_tag=array();
    
65.    var $xml_parser;
    
66.    var $Version = 1.0;
    
67.    var $tagtracker = array();
    
68. 
    
69.    /* Here are the XML functions needed by expat */
    
70. 
    
71. 
    
72.    /* when expat hits an opening tag, it fires up this function */
    
73.    function startElement($parser, $name, $attrs){
    
74. 
    
75.       array_push($this->current_tag, $name); // add tag to the cur. tag array
    
76.       $curtag = implode("_",$this->current_tag); // piece together tag
    
77. 
    
78.       /* this tracks what array index we are on for this tag */
    
79. 
    
80.       if(isset($this->tagtracker["$curtag"])) {
    
81.         $this->tagtracker["$curtag"]++;
    
82.       }
    
83.       else{
    
84.         $this->tagtracker["$curtag"]=0;
    
85.       }
    
86. 
    
87.       /* if there are attributes for this tag, we set them here. */
    
88. 
    
89.       if(count($attrs)>0) {
    
90.         $j = $this->tagtracker["$curtag"];
    
91.         if(!$j) $j = 0;
    
92. 
    
93.         if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
    
94.            $GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
    
95.         }
    
96. 
    
97.         $GLOBALS[$this->identifier]["$curtag"][$j]->store("attributes",$attrs);
    
98.       }
    
99.    
    
100.    }// end function startElement
     
101. 
     
102. 
     
103. 
     
104.    /* when expat hits a closing tag, it fires up this function */
     
105.    function endElement($parser, $name) {
     
106.       $curtag = implode("_",$this->current_tag); // piece together tag
     
107.       
     
108.       // before we pop it off,
     
109.       // so we can get the correct
     
110.       // cdata
     
111. 
     
112.       if(!$this->tagdata["$curtag"]) {
     
113.         $popped = array_pop($this->current_tag); // or else we screw up where we are
     
114.         return; // if we have no data for the tag
     
115.       }
     
116.       else{
     
117.         $TD = $this->tagdata["$curtag"];
     
118.         unset($this->tagdata["$curtag"]);
     
119.       }
     
120. 
     
121.       $popped = array_pop($this->current_tag);
     
122.       // we want the tag name for
     
123.       // the tag above this, it  
     
124.       // allows us to group the
     
125.       // tags together in a more
     
126.       // intuitive way.
     
127. 
     
128.       if(sizeof($this->current_tag) == 0) return; // if we aren"t in a tag
     
129. 
     
130.       $curtag = implode("_",$this->current_tag); // piece together tag
     
131.       // this time for the arrays
     
132. 
     
133.       $j = $this->tagtracker["$curtag"];
     
134.       
     
135.       if(!$j) $j = 0;
     
136. 
     
137.       if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
     
138.         $GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
     
139.       }
     
140. 
     
141.       $GLOBALS[$this->identifier]["$curtag"][$j]->store($name,$TD);
     
142.       #$this->tagdata["$curtag"]);
     
143.       unset($TD);
     
144.       return TRUE;
     
145.    } // end function endElement
     
146. 
     
147. 
     
148.    /* when expat finds some internal tag character data,
     
149.      it fires up this function */
     
150. 
     
151.    function characterData($parser, $cdata) {
     
152.       $curtag = implode("_",$this->current_tag); // piece together tag
     
153.       $this->tagdata["$curtag"] .= $cdata;
     
154.    }
     
155. 
     
156. 
     
157.    function xml($data,$identifier="xml") {  
     
158. 
     
159.       $this->identifier = $identifier;
     
160. 
     
161.       // create parser object
     
162.       $this->xml_parser = xml_parser_create();
     
163. 
     
164.       // set up some options and handlers
     
165.       xml_set_object($this->xml_parser,$this);
     
166.       xml_parser_set_option($this->xml_parser,XML_OPTION_CASE_FOLDING,0);
     
167.       xml_set_element_handler($this->xml_parser, "startElement", "endElement");
     
168.       xml_set_character_data_handler($this->xml_parser, "characterData");
     
169. 
     
170.       if (!xml_parse($this->xml_parser, $data, TRUE)) {
     
171.         sprintf("XML error: %s at line %d",
     
172.         xml_error_string(xml_get_error_code($this->xml_parser)),
     
173.         xml_get_current_line_number($this->xml_parser));
     
174.       }
     
175. 
     
176.       // we are done with the parser, so let"s free it
     
177.       xml_parser_free($this->xml_parser);
     
178. 
     
179.    }//end constructor: function xml()
     
180. 
     
181. 
     
182. }//thus, we end our class xml
     
183. 
     
184. ?>

复制代码

操作方法：

1. <?php
   
2. require("class.xml.php");
   
3. $file = "data.xml";
   
4. $data = implode("",file($file)) or die("could not open XML input file");
   
5. $obj = new xml($data,"xml");
   
6. 
   
7. 
   
8. print $xml["hans"][0]->num_results[0];
   
9. for($i=0;$i<sizeof($xml["hans"]);$i++) {
   
10.         print $xml["hans"][$i]->tag[0] . " ";
    
11. }
    
12. 
    
13. //To print url attributes (if they exist):
    
14. 
    
15. print $xml["hans"][0]->attributes[0]["size"];
    
16. 
    
17. ?>

复制代码

lovechoeg

此帖要顶，按个爪印防止忘了。。。


















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