使用round()函数
$number = 123.45678;
$rounded_number = round($number, 2);
echo $rounded_number; // 输出123.46
使用sprintf()函数
$number = 123.45678;
$formatted_number = sprintf(“%.2f”, $number);
echo $formatted_number; // 输出123.46
使用number_format()函数
$number = 123.45678;
$formatted_number = number_format($number, 2);
echo $formatted_number; // 输出123.46