how can i pass a url from a variable into frame tag

I have a php page where i have built an url now i want to pass that url into fram开发者_StackOverflow中文版e tag

 <frameset rows="100%">

<frame src=" <?= $url> ?>" />

</frameset>

The redirection doesnt seem to happen. Any pointers on what is going wrong?

Thanks

Prady

Andreas was right in pointing out the extra > after the url