Don't worry the categories are there. They just won't show up until there is a post in the caertogy.The other possibility is that you don't have the categories widget in your sidebar. You can go to Appearance / Widgets and drag the categories widget to your sidebar.
<topcat>10</topcat>
=== extension source ===
<pre>
<?php
# Top Categories Mediawiki extension
# display a list of the biggest categories on the wiki
# and the number of pages in them
# <topcat>23</topcat>
# where "23" would be the number of results to display
# by mutante 23.10.2005
$wgExtensionFunctions[] = "wfTopCatExtension";
function wfTopCatExtension() {
global $wgParser;
$wgParser->setHook( "topcat", "renderTopCat" );
}
function renderTopCat( $input ) {
$input = mysql_escape_string($input);
# check if input is integer else set to 5
if (is_int($input)){
$limit = $input;
} else {
$limit = 5;
}
$hd = mysql_connect("localhost", "wikiuser", "password") or die ("Unable to connect");
mysql_select_db ("wikidb", $hd) or die ("Unable to select database");
$res= mysql_query("SELECT cl_to , COUNT(*) AS total FROM categorylinks GROUP BY cl_to ORDER BY total DESC LIMIT $input", $hd) or die ("Unable to run query");
$output="<table border=\"1\"><tr><th colspan=\"2\" align=\"center\">Top $input Categories</th></tr><tr><th align=\"left\">category</th><th align=\"right\"># of pages</th></tr>";
while ($row = mysql_fetch_assoc($res))
{
$category = $row["cl_to"];
$pages = $row["total"];
$output.="<tr><td align=\"right\">$category</td><td align=\"right\">$pages</td></tr>";
}
$output.="</table>";
return $output;
}
</pre>
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