How to write the code for the back button?

Question

I have a php code here and I would like to create a "back" href to get me back to where I was before. Here\'s what I have:

Answer 1

In my application,above javascript function didnt work,because i had many procrosses inside one page.so following code worked for me hope it helps you guys.

  function redirection()
        {
            
            var redirect_to="";             
            window.location = redirect_to;

        }