$v['closed_price'] = 15.05;
$v['f_forecast_price'] = 14.68;
$diff = floatval($v['closed_price'] - $v['f_forecast_price']);
$closed_1 = floatval($v['closed_price']) * 0.1;
$rate =   ($closed_1 - $dff) / $closed_1 ;var_dump($closed_1 - $dff, $diff, $rate);
为什么$closed_1 - $dff是对的,但($closed_1 - $dff) / $closed_1得到一个1呢??理论上应该是小数才对。为啥呢???