(PHP 5 >= 5.6.0, PHP 7)
gmp_root — Take the integer part of nth root
gmp_root ( GMP|int|string $num , int $nth ) : GMP
Takes the nth root of num and returns the integer component of the result.
num
A GMP object, an int or a numeric string.
nth
The positive root to take of num.
The integer component of the resultant root, as a GMP number.
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https://www.php.net/manual/en/function.gmp-root.php