In an update to this post here is another way to obtain the number of likes for a Facebook page.
I’ll assume that you’ve already registered a Facebook application, have downloaded the PHP SDK and have included for use in your code.
Setup an array with your Facebook applications credentials
$facebook = new Facebook(array(
'appId' => '000000000', // Put appID here
'secret' => '0000c000c000c000c', // Put your secret key here
Decide which page you wish to obtain the number of likes for
$getRequest = $facebook->api('/cocacola'); // Lets look at the Facebook page for the popular soft drink
Obviously you can consume, contrast and display this information in more exciting ways than simply echoing it to the screen. Enjoy.