Unexpected behaviour of class_exist

For temporary purposes try the below code to avoid error –

if(isset($redux_demo['text-call-header']))
{
  echo $redux_demo['text-call-header']; 
}

Let me know if need more help.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)