$num = 10.45678;
//第一种：利用round()对浮点数进行四舍五入
echo
round
(
$num
,2);
//10.46
//第二种：利用sprintf格式化字符串
$format_num
= sprintf(
"%.2f"
,
$num
);
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