生成会员卡或优惠券

 for ($i = 0, $j = 0; $i < $num; $i++)         {          //$cardcode = ($maxcode+ $i).str_pad(mt_rand(0, 9999), 4, '0', STR_PAD_LEFT);          while(1){          $cardcode = str_pad(mt_rand(0, 99999999), 8, '0', STR_PAD_RIGHT);          $cmcard=$this->_mcard_mod->check_mcard_num($cardcode);       //判断是否重复          if($cmcard){          continue;          }else {          break;          }          }}