PHP method to format MYSQL to return float type_php tips

The example in this article describes how PHP formats MYSQL to return float type. Share it with everyone for your reference, the details are as follows:

Get the float field of mysql in PHP. After echo output, the decimal part contains multiple 0.

You can use floatval($num) to round off 0.

If you want to retain decimal places, you can use number_format($num, 2);

The number_format function rounds values ​​that exceed the specified number of digits.

If you don’t want to round, keep all decimals. You can use the following methods:

// 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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