Raise one number to the power of another, according to IEEE 754

说明

fpow(float $num, float $exponent): float

Returns the floating point result of raising num to the power of exponent. If num is zero and exponent is less than zero, then INF is returned.

参数

num: The base to use.
exponent: The exponent.

返回值

Returns a float corresponding to $num^$exponent.

示例

示例 #1 fpow() example

<?php
var_dump(fpow(10, 2));
var_dump(fpow(0, -3));
var_dump(fpow(-1, 5.5));
?>

以上示例会输出：

float(100)
float(INF)
float(NAN)

参见

Exponentiation operator **
pow() - 指数表达式
fdiv() - Divides two numbers, according to IEEE 754
fmod() - 返回除法的浮点数余数