Facebook like with dynamic URLs - PHP

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PHP Code:

function curPageURL() {
        $isHTTPS = (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on");
        $port = (isset($_SERVER["SERVER_PORT"]) && ((!$isHTTPS && $_SERVER["SERVER_PORT"] != "80") || ($isHTTPS && $_SERVER["SERVER_PORT"] != "443")));
        $port = ($port) ? ':'.$_SERVER["SERVER_PORT"] : '';
        $url = ($isHTTPS ? 'https://' : 'http://').$_SERVER["SERVER_NAME"].$port.$_SERVER["REQUEST_URI"];
                    return $url;
        }
            
echo '<div class="facebook_like">
                        <script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like href="'.curPageURL().'" show_faces="false" width="260"></fb:like>
      </div>';