小数位数保留

保留小数位数有很多种方法，常见的有round(),bcadd(),number_format(),sprintf()四种方法。其中round()的小数位数并不是那么可靠，它在值是整数的时候，会没有小数位数。

$str = ‘5.0000‘;

$strRound =  round($str,2);
echo ‘round: ‘.$strRound;
echo ‘<br/>‘;

$strBcadd =  bcadd($str,0,1);
echo ‘bcadd: ‘.$strBcadd;
echo ‘<br/>‘;

$strNubmerFormat =  number_format($str,2);
echo ‘number_format: ‘.$strNubmerFormat;
echo ‘<br/>‘;

$strSprintf =  sprintf(‘%.2f‘,$str);
echo ‘sprintf: ‘.$strSprintf;
echo ‘<br/>‘;

输出

round: 5

bcadd: 5.0

number_format: 5.00

sprintf: 5.00