gmp_binomial

(PHP 7 >= 7.3.0, PHP 8)

gmp_binomial — Calculates binomial coefficient

function gmp_binomial(GMP |int |string $n, int $k): GMP

Calculates the binomial coefficient C(n, k).

n: GMP 对象、int 或 string ,可以按照跟在 gmp_init() 中使用字符串并自动检测 base(即当 base 等于 0 时)相同的逻辑将其解释为数字。
k

Returns the binomial coefficient C(n, k).

Throws ValueError if k is negative. Prior to PHP 8.0.0, E_WARNING was issued instead.

版本	说明
8.0.0	This function no longer returns `false` on failure.