mirror of
https://github.com/Respect/Validation.git
synced 2024-06-01 13:22:24 +02:00
ef8a8f4b27
There is no need for that file to be a Markdown, and it can be a plain text file. Signed-off-by: Henrique Moody <henriquemoody@gmail.com>
46 lines
1 KiB
PHP
46 lines
1 KiB
PHP
<?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 file
|
|
* that was distributed with this source code.
|
|
*/
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace Respect\Validation\Rules;
|
|
|
|
use function is_numeric;
|
|
|
|
/**
|
|
* Validates whether the input follows the Fibonacci integer sequence.
|
|
*
|
|
* @author Danilo Correa <danilosilva87@gmail.com>
|
|
* @author Henrique Moody <henriquemoody@gmail.com>
|
|
* @author Samuel Heinzmann <samuel.heinzmann@swisscom.com>
|
|
*/
|
|
final class Fibonacci extends AbstractRule
|
|
{
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function validate($input): bool
|
|
{
|
|
if (!is_numeric($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;
|
|
}
|
|
}
|