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<?php
declare(strict_types=1);
/**
* This file is part of Esi\ConsistentHash.
*
* (c) Eric Sizemore <[email protected]>
* (c) Paul Annesley <[email protected]>
* This source file is subject to the MIT license. For the full copyright and
* license information, please view the LICENSE file that was distributed with
* this source code.
*/
namespace Esi\ConsistentHash\Hasher;
* Uses MurmurHash3 to hash a value into a 32bit int.
* Note: specifically uses the 'murmur3a' algo in PHP's hash().
* @todo Look into murmur3c (128-bit hash on x86 architecture) and murmur3f (128-bit hash on x64 architecture)
* @see https://github.com/aappleby/smhasher
class Murmur3Hasher implements HasherInterface
{
* {@inheritDoc}
* 8 hexits = 32bit, which also allows us to forego having to check whether
* it is over PHP_INT_MAX.
* The substring is converted to an int since hex strings sometimes get
* treated as ints if all digits are ints and this results in unexpected
* sorting order.
public function hash(string $string): int
return (int) hexdec(substr(hash('murmur3a', $string), 0, 8));
}
ericsizemore /
consistent-hash
