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<?php
function bcadd(string $left_operand, string $right_operand, int $scale = UNKNOWN) : string {}
function bcsub(string $left_operand, string $right_operand, int $scale = UNKNOWN) : string {}
function bcmul(string $left_operand, string $right_operand, int $scale = UNKNOWN) : string {}
function bcdiv(string $dividend, string $divisor, int $scale = UNKNOWN) : ?string {}
function bcmod(string $dividend, string $divisor, int $scale = UNKNOWN) : ?string {}
/** @return string|false */
function bcpowmod(string $base, string $exponent, string $modulus, int $scale = UNKNOWN) {}
function bcpow(string $base, string $exponent, int $scale = UNKNOWN) : string {}
function bcsqrt(string $operand, int $scale = UNKNOWN) : ?string {}
function bccomp(string $left_operand, string $right_operand, int $scale = UNKNOWN) : int {}
function bcscale(int $scale = UNKNOWN) : int {}
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