gmp_root

(PHP 5 >= 5.6.0, PHP 7)

gmp_root — Take the integer part of nth root

gmp_root ( GMP $a , int $nth ) : GMP

Takes the nth root of a and returns the integer component of the result.

a: Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.
nth: The positive root to take of a.

The integer component of the resultant root, as a GMP number.