Takes the nth root of a and
returns the integer component of the result.
Parameters
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.
Return Values
The integer component of the resultant root, as a GMP number.
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