Fatal error: Only variables can be passed by reference in /etc/apache2/htdocs/drupal/modules/civicrm/CRM/Utils/String.php on line 112

Receive same message from Controller.php and QuickForm.php.
CiviCRM V1.0 beta, Drupal 4.6.2, PHP 5.1.0b3
In String.php made following change:
static function getClassName( $string, $char = '_' )

{ /* return array_pop( explode( $char, $string ) ); */ $jeff = explode( $char, $string ); return array_pop( $jeff ); }

and it seems to work. Controller and QuickForm are more difficult.
I'm very new to this.
Jeff Chochon