To get any root of a number your can use the pow() function:
pow(8, 1/3)
which gives you the third root of eight.
Jouhni
(PHP 4, PHP 5, PHP 7, PHP 8)
sqrt — 平方根
num
要处理的参数
返回 num
的平方根,负数时返回 NAN
。
示例 #1 sqrt() 示例
<?php
// 精度取决于精度指令
echo sqrt(9); // 3
echo sqrt(10); // 3.16227766 ...
?>
M_SQRTPI
——sqrt(pi)
M_2_SQRTPI
——2/sqrt(pi)
M_SQRT2
——sqrt(2)
M_SQRT3
——sqrt(3)
M_SQRT1_2
——1/sqrt(2)
To get any root of a number your can use the pow() function:
pow(8, 1/3)
which gives you the third root of eight.
Jouhni