PHP 8.4.0 RC4 available for testing

fpow

(PHP 8 >= 8.4.0)

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

説明

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.

パラメータ

num
The base to use.
exponent
The exponent.

戻り値

Returns a float corresponding to $num$exponent.

例1 fpow() example

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

上の例の出力は以下となります。

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

参考

  • Exponentiation operator **
  • pow() - 指数表現
  • fdiv() - IEEE 754 に従い、数値の除算を行う
  • fmod() - 引数で除算をした際の剰余を返す
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