Cleanest way to include urls in Moodle emails

I'd like to know which is the cleanest way to insert an url in an email sent by Moodle module. So far I'm using this formula, what IMHO I don't think is the cleanest way: $url = $CFG->wwwroot.'/mod/<mymodulename>/view.php?id='.$cm->id; The things I don't like here are: - Using $CFG->wwwroot - /mod/<mymodulename> needs to be provided always. (Assume here that I'm using a constant instead of a hardcoded string). I expected Moodle to have a function to provide this out of the box just when providing module script. I've tried moodle_url but this function doesn't provide the path to the php script when used this way: new moodle_url('view.php?id='.$cm->id); I just get: view.php?id=XX Thanks in advance.