MediaWiki扩展：随机展示

wangsisi

This extension allows for randomly-generated content inside your wiki; e.g. rotating images, random greetings, etc.

Example

The code in this page will only work in MediaWiki 1.5 and above. (Alternate version for 1.4.x)

Algorithm 05:57, 8 September 2005 (UTC)

1. <?php
   
2. # Wiki random selection extension
   
3. # Randomly chooses one of the given options to display.
   
4. # Usage: <choose><option>A</option><option>B</option></choose>
   
5. # Optional parameter: <option weight="3"> == 3x weight given
   
6. 
   
7. $wgExtensionFunctions[] = "wfChooseExt";
   
8. 
   
9. function wfChooseExt()
   
10. {
    
11.      global $wgParser;
    
12.      $wgParser->setHook( "choose", "renderChosen" );
    
13. }
    
14. 
    
15. function renderChosen( $input )
    
16. {
    
17.      # Prevent caching
    
18.      global $wgParser;
    
19.      $wgParser->disableCache();
    
20. 
    
21.      # Choose an option at random
    
22.      $len = preg_match_all("/<option(?:(?:\\s[^>]*?)?\\sweight=["']?([^\\s>]+))?"
    
23.          . "(?:\\s[^>]*)?>([\\s\\S]*?)<\\/option>/", $input, $out);
    
24.      $r = 0;
    
25.      for($i=0; $i<$len; $i++)
    
26.      {
    
27.          if(strlen($out[1][$i])==0) $out[1][$i] = 1;
    
28.          else $out[1][$i] = intval($out[1][$i]);
    
29.          $r += $out[1][$i];
    
30.      }
    
31.      if($r <= 0) return "";
    
32.      $r = mt_rand(1,$r);
    
33.      for($i=0; $i<$len; $i++)
    
34.      {
    
35.          $r -= $out[1][$i];
    
36.          if($r <= 0)
    
37.          {
    
38.              $input = $out[2][$i];
    
39.              break;
    
40.          }
    
41.      }
    
42. 
    
43.      # Render chosen text
    
44.      global $wgUser, $wgTitle;
    
45.      $parserOptions = ParserOptions::newFromUser( $wgUser );
    
46.      $localParser = new Parser();
    
47.      $input = $localParser->parse($input, $wgTitle, $parserOptions, false);
    
48.      return $input->mText;
    
49. }
    
50. ?>

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