Wikipedia in WP 2.0

<?php
/*
Plugin Name: GetWIKI
Version: 1.0
Plugin URI: http://saj.in/blog/techtalk/82/getwiki-plugin-for-wordpress.asp
Author: Sajin Kunhambu
Author URI: http://saj.in/
Description: Get a WIKI article anywhere on yout blog (e.g. ~GetWIKI(Your_Search_Term)~ )
*/


//Server Configuration
$host = "de.wikipedia.org";
$port = 80;
$path = "/wiki/";
//Plugin Configuration
$use_cache = true;
$cache_life = 10080;
$edit_link = false;
$retrieved_link = false;
$copy_left = "<div class=\"gfdl\">&copy;Dieser Artikel basiert auf dem Artikel <a href=\"http://artikellink\">XYZ</a> aus der freien Enzyklopädie <a href=\"http://de.wikipedia.org\">Wikipedia</a> und steht unter der <a href=\"http://link auf lokale kopie\">GNU-Lizenz für freie Dokumentation</a>. In der Wikipedia ist eine <a href=\"http://liste der autoren_link\">Liste der Autoren</a> verfügbar.</div>";
if( !function_exists(cache_recall) || !function_exists(cache_store) ) { 
        // caching function not available 
        $use_cache = false; 
} 


function cleanUp( $article ) {
    global $edit_link,$retrieved_link,$copy_left;
    $article = str_replace("\n","",$article);
    if(preg_match("/^.*(\<\!\-\- start content \-\-\>.*\<\!\-\- end content \-\-\>).*$/i",$article,$match)!=0) $article = $match[1];
    $article = preg_replace("#\<\!\-\-.*\-\-\>#imseU","",$article);
    $article = preg_replace("#\[\!\&\#.*\]#imseU","",$article);
    if(!$retrieved_link) $article = preg_replace("#\<div\sclass=\"printfooter\".*\<\/div\>#imseU","",$article);
    if(!$edit_link) $article = preg_replace("#\s*\<div\s*class=\"editsection\".*\<\/div\>\s*#imseU","",$article);
    $article = str_replace("/w/","http://de.wikipedia.org/w/",$article);
    $article = str_replace("/wiki/","http://de.wikipedia.org/wiki/",$article);
    $article = str_replace("/skins-1.5/","http://de.wikipedia.org/skins-1.5/",$article);
    $article = "<div class=\"wiki\">".$article.$copy_left."</div>";
    return $article;
}


function getArticle( $title ) {
    global $host,$port,$path,$use_cache,$cache_life;
    if($use_cache) { 
        $function_string = "getArticle(".$title.")"; 
        if($article = cache_recall($function_string,$cache_life)) return $article; 
    } 
    $out = "GET $path$title HTTP/1.0\r\nHost: $host\r\nUser-Agent: GetWiki for WordPress\r\n\r\n";
    $fp = fsockopen($host, $port, $errno, $errstr, 30);
    fwrite($fp, $out);
    $article = "";
    while (!feof($fp)) {
        $article .= fgets($fp, 128);
    }
    if(substr($article,0,12)=="HTTP/1.0 301")
    {
        if(preg_match("/^.*Location\:\s(\S*).*$/im",$article,$match)!=0) {
            $article = str_replace("http://de.wikipedia.org/wiki/","",$match[1]);
            $article = getArticle( $article );
        } else {
            $article = "== WIKI Error ==";
        }
    }
    fclose($fp);
    $article = cleanUp($article);
    if($use_cache) cache_store($function_string,$article); 
    return $article;
}


function wikify( $text ) {
    $text = preg_replace(
        "#\~GetWIKI\((\S*)\)\~#imseU",
        "getArticle('$1')",
        $text
    );
    return $text;
}


function wiki_css() {
    echo "
    <style type='text/css'>
    div.wiki {
        border: 1px solid silver;
        background-color: #f5f5f5;
    }
    div.gfdl {
        font-size: 80%;
    }
    </style>
    ";
}




//echo wikify("~GetWIKI(user:Sajin)~");
add_action('wp_head', 'wiki_css');
add_filter('the_content', 'wikify', 2);
add_filter('the_excerpt', 'wikify', 2);
?>

function cleanUp( $article ) {
    global $edit_link,$retrieved_link,$copy_left;
    $article = str_replace("\n","",$article);
    [COLOR=Red]if(preg_match("/^.*(\<\!\-\- start content \-\-\>.*\<\!\-\- end content \-\-\>).*$/i",$article,$match)!=0) $article = $match[1];[/COLOR]
    $article = preg_replace("#\<\!\-\-.*\-\-\>#imseU","",$article);
    $article = preg_replace("#\[\!\&\#.*\]#imseU","",$article);
    if(!$retrieved_link) $article = preg_replace("#\<div\sclass=\"printfooter\".*\<\/div\>#imseU","",$article);
    if(!$edit_link) $article = preg_replace("#\s*\<div\s*class=\"editsection\".*\<\/div\>\s*#imseU","",$article);
    $article = str_replace("/w/","http://de.wikipedia.org/w/",$article);
    $article = str_replace("/wiki/","http://de.wikipedia.org/wiki/",$article);
    $article = str_replace("/skins-1.5/","http://de.wikipedia.org/skins-1.5/",$article);
    $article = "<div class=\"wiki\">".$article.$copy_left."</div>";
    return $article;
}