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HomeBackend DevelopmentPHP TutorialPHP格式化MYSQL返回float类型的方法_PHP

本文实例讲述了PHP格式化MYSQL返回float类型的方法。分享给大家供大家参考,具体如下:

PHP 中获取mysql的float字段,echo 输出后,小数部分为包含多个0.

可使用 floatval($num) 将0舍去。

如要保留小数位,可使用 number_format($num, 2);

number_format函数对超过指定位数的值,进行了四舍五入。

如不想四舍五入,而保留所有小数。可使用如下方法:

// 如仅想保留两位小数可用 number_format($num, 2);
echo f('1001.334534', 2) . '<br>'; // 1001.334534
echo f('-1001.000', 2) . '<br>'; // -1001.00
echo f('1001.3', 5) . '<br>'; // 1001.30000
echo f('1001.33') . '<br>'; // 1001.33
echo f('1001.000') . '<br>'; // 1001
// 格式化小数,但不四舍五入,如有小数则全保留,无小数则添加0;
function f($num, $v = 0)
{
  $num = floatval($num);
  if ($v > 0)
  {
    $num = '' . $num;
    $arr = explode('.', $num);
    if (count($arr) === 1)
    {
      $num .= '.' . str_repeat('0', $v);
    }
    else
    {
      $v -= strlen($arr[1]);
      if ($v > 0)
        $num .= str_repeat('0', $v);
    }
  }
  return $num;
}

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