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结合一下网上的例子 $num = 10.4567;
//第一种：利用round()对浮点数进行四舍五入 但是这个如果没有两位小数也不会"两位精度"
echo round($num,2); //10.46 echo round('1.1',2); //1.1
//第二种：利用sprintf格式化字符串 并进行四舍五入
$format_num = sprintf("%.2f",$num); 2 echo $format_num; //10.46 //第三种：利用千位分组来格式化数字的函数number_format() echo number_format($num, 2); //10.46 //或者如下
echo number_format($num, 2); //10.46
$num = 123213.666666; echo sprintf("%.2f",substr(sprintf("%.3f", $num), 0, -2));
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