Calculates binomial coefficient

# gmp_binomial

(PHP 7 >= 7.3.0, PHP 8)

gmp_binomial — Calculates binomial coefficient

### 说明

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

Calculates the binomial coefficient C(n, k).

### 参数

`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`

### 返回值

Returns the binomial coefficient C(n, k).

### 错误／异常

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

### 更新日志

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

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