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

# fpow

(PHP 8 >= 8.4.0)

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

### 说明

function 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

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