Online PHP editor | output for 3YOCE

<?php class SeededRandomNumberGenerator { // An integer with the 32 least significant bits set // 0xffffffff is a float on 32-bit platforms :-/ const MASK = \PHP_INT_SIZE === 4 ? ~0 : 0xffffffff; private $seed; public function __construct(int $seed) { $this->seed = $seed & self::MASK; } /** * Add two integers, wrap around on overflow (avoid float coersion) * https://stackoverflow.com/questions/4068033/add-two-integers-using-only-bitwise-operators */ private static function intAdd(int $a, int $b): int { $a &= self::MASK; $b &= self::MASK; $carry = $a & $b; $result = $a ^ $b; while ($carry) { $carry &= self::MASK; $shiftedCarry = $carry << 1; $carry = $result & $shiftedCarry; $result ^= $shiftedCarry; } return $result & self::MASK; } /** * Multiply two integers, wrap around on overflow (avoid float coersion) * https://stackoverflow.com/questions/4456442/multiplication-of-two-integers-using-bitwise-operators */ private static function intMul(int $a, int $b): int { $a &= self::MASK; $b &= self::MASK; $result = 0; while ($b) { if ($b & 0b1) { $result = self::intAdd($result, $a); } $a = ($a << 1) & self::MASK; $b >>= 1; } return $result; } /** * Generate a pseudo-random number from a seed * https://stackoverflow.com/questions/4768180/rand-implementation */ public function generate() { return (($this->seed = self::intAdd(self::intMul($this->seed, 214013), 2531011)) >> 16) & 0x7fff; } } $gen = new SeededRandomNumberGenerator(7623); for ($i = 0; $i < 15; $i++) { echo "{$gen->generate()}\n"; }