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I saw it sometimes when a plugin writer directly construct a permalink (also called item link) by doing this:

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echo "<a href=\"index.php?itemid=".$itemid."\">".$title."</a>";

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This works fine usually, but the link will be incorrect in a FancyURL setup.

So next time when your plugin need to generate a permalink, do this:

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$url   = createItemLink($itemid);
echo "<a href=\"index.php?itemid=".$url."\">".$title."</a>";
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createItemLink takes care of constructing the item link for you and takes into account of whether FancyURL is enabaled.

However, there is a problem currently (as of Nucleus 3.0) that createItemLink() is broken when CONF['Self'] is empty. This happens in most of the cases except during skinVar processing (ie doSkinVar()).

The solution for now is to add the following code before you call createItemLink:

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// a little hack to get a working permanent URL for the item
if (!$CONF['ItemURL'])
  $CONF['ItemURL'] = $blog->getURL();                                                                                
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