Simply paste the following code in any of your theme files, where you want your Facebook fan count to be displayed. Don’t forget to add your page ID on line 2!
<?php
$page_id = "YOUR PAGE-ID";
$xml = @simplexml_load_file("http://api.facebook.com/restserver.php?method=facebook.fql.query&query=SELECT%20fan_count%20FROM%20page%20WHERE%20page_id=".$page_id."") or die ("a lot");
$fans = $xml->page->fan_count;
echo $fans;
?>
Thanks to WP Snippets for the recipe!
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Display number of Facebook fans in full text on your WordPress blog