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<?php /* * This file is part of Respect/Validation. * * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net> * * For the full copyright and license information, please view the "LICENSE.md" * file that was distributed with this source code. */ namespace Respect\Validation\Rules; /** * @author Samuel Heinzmann <samuel.heinzman@swisscom.com> */ class Fibonacci extends AbstractRule { /** * {@inheritdoc} */ public function validate($input) { if (!is_numeric($input)) { return false; } $sequence = [0, 1]; $position = 1; while ($input > $sequence[$position]) { ++$position; $sequence[$position] = $sequence[$position - 1] + $sequence[$position - 2]; } return $sequence[$position] === (int) $input; } }