call a function within the same class

Dear all, I recently started PHP OOP and I'm bit confused about best and the most efficient methods when 'declaring a class' and 'calling function', could somebody explain me with following sample code, it would be great.. thanks.. class classLdap{ $rslt = $_POST['rslt']; function ldapConnect($rslt){ .... ...... return $rslt; }// end function ldapConnect function ldapAdd($rslt){ // i want to call ldapConnect($rslt) here what is the best method. $rslt = classLdap::ldapConnect($rslt); //or //(curently i'm doing this way, it's to lengthy) $new_classLdap = new classLdap; $rslt = $new_classLdap->ldapConnect($rslt); //or $rslt = $this->ldapConnect($rslt); }// end function ldapAdd }// end class -- vk.