1. Download GeSHi (Generic Syntax Highlighter).
2. Upload geshi.php and the geshi folder to your MediaWiki extensions folder.
3. Create GeSHiHighlight.php using this source code.
4. Copy the following line to your LocalSettings.php file.

   include("extensions/GeSHiHighlight.php");

5. Add code to a MediaWiki page using <pre> tags.

   <php><?php echo "Hello World!"; ?></php>
   

More information about GeSHI can be found at http://qbnz.com/highlighter/.

Edit: Oops. I had posted the last step with <pre> tags instead of <php>. I’ve fixed it now. Thanks override!

Using 301 Redirects

A popular variation on the Canonical Hostnames Example in Apache’s URL Rewriting Guide is to add the following to your root .htaccess file:

RewriteEngine on
# Redirect index.php to /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /.*index\.php?\ HTTP/ [NC]
RewriteRule ^(.*)index.php?$ http://www.example.com/$1 [R=301,L]
# Redirect www to non-www (or reverse if you prefer www)
RewriteCond %{HTTP_HOST} ^www.example.com$
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]


One alternate method to use if you can’t get access to your .htaccess file is to use a php function like the one below. This would work great for a WordPress blog if you were to install it as the first line in your theme header.php file since it will be called for every page.

<?php
if ($_SERVER['HTTP_HOST']=='www.example.com' || $_SERVER['REQUEST_URI']=='/index.php') {
header("HTTP/1.1 301 Moved Permanently");
header('Location: ' . 'http://example.com/');
} ?>

Good Internal Link Structure

Make sure the links on your own site are consistent. If some of your links point to example.com and some point to www.example.com, there could be potential duplicate content issues. Pick the version you prefer and always use that format for your internal links.

XML Sitemaps

The sitemaps XML format is explained at sitemaps.org. In November 2006, Google, Yahoo, and Microsoft announced autodiscovery support for sitemaps via robots.txt. By April 2007, Google, Ask, Yahoo, and Microsoft had all confirmed support for XML sitemaps. For autodiscovery, add the following line to your robots.txt file:

Sitemap: <sitemap_location>

Of course, you should make sure the links used in your XML sitemaps are well-formed and correctly pointing to your preferred domain. Make sure to keep your sitemap file up to date. You can find more information about how the top search engines’ handle sitemaps including how to ping your sitemaps file or submit it manually using Google Webmaster Central and Yahoo Search Site Explorer.

• Creating Google Sitemaps Files
• Yahoo Sitemap Support
• Indexing on MSN Search
• Ask.com Sitemap Suport

Ping Addresses

• http://www.google.com/webmasters/tools/ping?sitemap=
  http%3A%2F%2Fwww.yoursite.com%2Fsitemap.gz
• http://ping.feeds.yahoo.com/rss/ping?u=[THE URL OF YOUR FEED]
• http://submissions.ask.com/ping?sitemap=http%3A//www.the URL of your sitemap here.xml

Don’t forget about human readable site maps. Read Shari Thurow’s thoughts on the right way to think about site maps.

Set Your Preferred Domain in Google Webmaster Central

In addition to adding an XML sitemap, you can set your preferred domain in Google Webmaster Central.

• How to set your preferred domain in Google.

<?php
if (is_home()) {
   $description = "Default description of this website.";
   $keywords = "default, keyword, list";
} else {
   $description = get_post_meta($post->ID,'description',TRUE);
   $keywords = get_post_meta($post->ID,'keywords',TRUE);
}
if ($description) {
   echo "\\t<meta name=\"description\" content=\"$description\" />\\n";
   }
if ($keywords) {
   echo "\\t<meta name=\"keywords\" content=\"$keywords\" />\\n";
   }
?>

Here is another similar method:

<?php
  $pagetitle = get_post_meta($post->ID,'pagetitle',TRUE);
  $description = get_post_meta($post->ID,'description',TRUE);
  $keywords = get_post_meta($post->ID,'keywords',TRUE);
  if (empty($pagetitle)) {
    echo "<title>";
    wp_title('');
    echo " - ";
  } else {
    echo "<title>";
    if ($pagetitle!='') {echo "$pagetitle - ";}
  }
  bloginfo('name');
  echo "</title>";
  if (!empty($description)) {
    echo "\\t<meta name=\"description\" content=\"$description\" />\\n";
  }
  if (!empty($keywords)) {
    echo "\\t<meta name=\"keywords\" content=\"$keywords\" />\\n";
  }
?>

Other meta tags, like character set, are hard coded into the main header.php code because they are the same on every page.

You can find more information about Using Custom Fields on wordpress.org. There are several meta plugins listed on wordpress.org, and a search for custom fields plugins wordpress on Google will return even more options.