(PHP 5 >= 5.6.0, PHP 7, PHP 8)
gmp_rootrem — Take the integer part and remainder of nth root
Takes the nth root of num and
returns the integer component and remainder of the result.
numGMP 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。
nth
The positive root to take of num.
A two element array, where the first element is the integer component of the root, and the second element is the remainder, both represented as GMP numbers.