title: converting string to URL in PHP
body: <p>I have a string in php and I want to convert it into a URL,Basically I am taking input from the user so I am not sure either he write <code>http://www.google.com</code> or just <code>www.google.com</code> or maybe just <code>google.com</code>, In either cases I have to show him the URL link in an anchor tag.
  I am looking for any PHP function that can do this,
  Otherwise I have to manually search for <code>http</code> and other If else condition will surely gonna waste my time,If there is no function I would be more than happy to write one and make it open to the community.
  <strong>EDIT:</strong>
  Another thing is the best way to write HTML in PHP, I mean is it good if we use echo' long HTML Forms' etc
  any solution
  Thanks</p>