PHP uses bit operations to implement addition, subtraction, multiplication and division of integers and test them (code example)

>= 1; } return $res; } private static function isNegative(int $n) : bool { return $n < 0; } /** * a/b a = MIN_INTEGER, b!=MIN_INTEGER ? * @param int $a * @param int $b * @return int */ private static function p(int $a, int $b) : int { $x = self::isNegative($a) ? self::negateNumber($a) : $a; $y = self::isNegative($b) ? self::negateNumber($b) : $b; $res = 0; for ($i = 31; $i >-1; $i = self::minus($i, 1)) { if (($x >> $i)>=$y) { $res |= (1 << $i); $x = self::minus($x, $y<<$i); } } return self::isNegative($a) ^ self::isNegative($b) ? self::negateNumber($res):$res; } /** * @param int $a * @param int $b * @return int $a / $b */ public static function pide(int $a, int $b) : int { if ($b === 0) { throw new RuntimeException("pisor is 0"); } if ($a === self::MIN_INTEGER && $b === self::MIN_INTEGER) { return 1; } else if ($b === self::MIN_INTEGER) { return 0; } else if ($a === self::MIN_INTEGER) { $res = self::p(self::add($a, 1), $b); return self::add($res, self::p(self::minus($a, self::multiple($res, $b)), $b)); } else { return self::p($a, $b); } } }

echo Arithmetic::add(1, 2).PHP_EOL; // 3 echo Arithmetic::minus(10, 3).PHP_EOL; // 7 echo Arithmetic::multiple(5, 3).PHP_EOL; // 15 echo Arithmetic::pide(-2147483648, 1).PHP_EOL; // -2147483648 echo Arithmetic::pide(-15, 3).PHP_EOL; // -5