if ($this->in_fb_canvas()) {
echo '<fb:redirect url="' . $url . '"/>';
} else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {
if ($this->in_fb_canvas()) {
echo '<fb:redirect url="' . $url . '"/>';
} else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {