(PHP 5 >= 5.6.0, PHP 7, PHP 8)
gmp_root — Take the integer part of nth root
Takes the nth root of num and
returns the integer component of the result.
num
A GMP object, an int,
or a string that can be interpreted as a number following the same logic
as if the string was used in gmp_init() with automatic
base detection (i.e. when base is equal to 0).
nth
The positive root to take of num.
The integer component of the resultant root, as a GMP number.