Call-time pass-by-reference warnings

Warning: set_time_limit(): Cannot set time limit in safe mode in /xxx/public_html/testas/usenet/tasks/synchronise.php on line 6
PHP Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of [runtime function name](). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in xxx/public_html/testas/usenet/lib/PersistenceManager.php on line 83

Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of [runtime function name](). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in xxx/public_html/testas/usenet/lib/PersistenceManager.php on line 83