MediaWiki扩展：随机展示
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)
<?php
# Wiki random selection extension
# Randomly chooses one of the given options to display.
# Usage: <choose><option>A</option><option>B</option></choose>
# Optional parameter: <option weight="3"> == 3x weight given
$wgExtensionFunctions[] = "wfChooseExt";
function wfChooseExt()
{
global $wgParser;
$wgParser->setHook( "choose", "renderChosen" );
}
function renderChosen( $input )
{
# Prevent caching
global $wgParser;
$wgParser->disableCache();
# Choose an option at random
$len = preg_match_all("/<option(?:(?:\\s[^>]*?)?\\sweight=[\"']?([^\\s>]+))?"
. "(?:\\s[^>]*)?>([\\s\\S]*?)<\\/option>/", $input, $out);
$r = 0;
for($i=0; $i<$len; $i++)
{
if(strlen($out[$i])==0) $out[$i] = 1;
else $out[$i] = intval($out[$i]);
$r += $out[$i];
}
if($r <= 0) return "";
$r = mt_rand(1,$r);
for($i=0; $i<$len; $i++)
{
$r -= $out[$i];
if($r <= 0)
{
$input = $out[$i];
break;
}
}
# Render chosen text
global $wgUser, $wgTitle;
$parserOptions = ParserOptions::newFromUser( $wgUser );
$localParser = new Parser();
$input = $localParser->parse($input, $wgTitle, $parserOptions, false);
return $input->mText;
}
?>
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