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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; class PrimeNumber extends AbstractRule { public function validate($input) { if (!is_numeric($input) || $input <= 1) { return false; } if ($input != 2 && ($input % 2) == 0) { return false; } for ($i = 3; $i <= ceil(sqrt($input)); $i += 2) { if (($input % $i) == 0) { return false; } } return true; } }