How to check valid object of class in smarty?

Question

Is there any function in smarty to check valid object of class in smarty?

Suppose $obj is having some value or not.

How to check $obj is object of 'TestClass' or not in smarty?

Answer 1

This is the way to check variable is object of specific class in Smarty.

if( true eq isset($obj) && true eq is_object($obj) && $obj instanceof 'TestClass' ){
//do something
}

Answer 2

this works in Smarty2 and Smarty3:

{if $obj instanceof TestClass}
  …
{/if}