(PHP 5 >= 5.6.0, PHP 7, PHP 8)
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 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.
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https://www.php.net/manual/en/function.gmp-root.php