值传送

    class GetMacAddr   

    {   

            var $return_array = array(); 

            var $mac_addr;   

               

            function GetMacAddr($os_type)

            {   

                    switch ( strtolower($os_type) )   

                    {   

                            case "linux":

                                    $this->forLinux();   

                                    break;   

                            case "solaris":   

                                    break;   

                            case "unix":   

                                    break;   

                            case "aix":   

                                    break;   

                            default:   

                                    $this->forWindows();   

                                    break;   

                    }