class SoftDeleteBehavior extends CActiveRecordBehavior{
    //put your code here
    public $deleteColumn = 'deleted';
    public $deletedByColumn = 'deletedBy';

    public function beforeDelete($event) {
        $dc = $this->deleteColumn;
        $dbc = $this->deletedByColumn;
        if($this->owner->hasAttribute($dc))
            $this->owner->$dc = 1;
        if($this->owner->hasAttribute($dbc))
            $this->owner->$dbc = Yii::app()->user->id;

        $this->owner->save();
        /**
         * $event->isValid = false is needed
         * so that delete() will not be executed
         */
        $event->isValid = false;
    // doesn't work
    //return false;

        return parent::beforeDelete($event);
    }