PHP urlencode | Facebook Like Box

Ok I'm a total amateur when it comes to PHP, not my strong suite. All I know is:

<?php bitly(); ?> output's correctly what I wan't. But I am trying to encode what it outputs to a url readable by a Facebook like box button.

How could I go about doing this?

When i use that for the url of the facebook likebox i get a red error message

Source: http://facebook.stackoverflow.com/questions/13446738/php-urlencode-facebook-like-box

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