(PHP 7 >= 7.3.0, PHP 8)
gmp_kronecker — Kronecker symbol
gmp_kronecker(GMP|int|string $num1, GMP|int|string $num2): int
This function computes the Kronecker symbol of num1 and num2.
num1 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).
num2 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).
Returns the Kronecker symbol of num1 and num2
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https://www.php.net/manual/en/function.gmp-kronecker.php