title: Do php's strip_tag function consider a string with two underlines a constructor?
body: <p>I'm using PHP's <code>strip_tag</code> function in a WordPress project, and it works just ok, except when a link that contains two underlines 
  (<strong>for example:</strong> <code>http://www.youtube.com/watch?v=CS7e1__lyn4</code>) comes in. When the link comes in, it returns empty. Is there a way to tell <code>strip_tag</code> to ignore two underlines?</p>