(PHP 8 >= 8.4.0)
fpow — Raise one number to the power of another, according to IEEE 754
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.
numexponent
Returns a float corresponding to
$num$exponent.
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)