floor 舍去法取整 语法格式:float floor ( float value )
返回不大于value 的下一个整数,将value 的小数部分舍去取整。floor() 返回的类型仍然是float,因为float 值的范围通常比integer 要大。
echo floor(4.3); // 4
echo floor(9.999); // 9
ceil 进一法取整 语法格式: float ceil ( float value )
返回不小于value 的下一个整数,value 如果有小数部分则进一位。ceil() 返回的类型仍然是float,因为float 值的范围通常比integer 要大
echo ceil(4.3); // 5
echo ceil(9.999); // 10
round 对浮点数进行四舍五入
语法:float round ( float val [, int precision] )
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6); // 4
echo round(3.6, 0); // 4
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
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