title: How to check valid object of class in smarty?
body: <p>Is there any function in smarty to check valid object of class in smarty?</p>
  
  <p>Suppose <code>$obj</code> is having some value or not.</p>
  
  <p>How to check <code>$obj</code> is object of 'TestClass' or not in smarty?</p>