Enrolment

        if ($CFG->enrol_ldap_search_sub){
            //use ldap_search to find first user from subtree
            $ldap_result = ldap_search($ldap_connection, 
                                        $context, 
                                        $ldap_search_pattern,
                                        $ldap_fields_wanted);

        } else {
            //search only in this context
            $ldap_result = ldap_list($ldap_connection, 
                                        $context, 
                                        $ldap_search_pattern,
                                        $ldap_fields_wanted,0,0);
        }