49 lines
1.0 KiB
PHP
49 lines
1.0 KiB
PHP
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<?php
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/*
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* Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
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* SPDX-License-Identifier: MIT
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*/
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declare(strict_types=1);
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namespace Respect\Validation\Rules;
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use function ceil;
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use function is_numeric;
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use function sqrt;
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/**
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* Validates whether the input is a prime number.
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*
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* @author Alexandre Gomes Gaigalas <alganet@gmail.com>
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* @author Camilo Teixeira de Melo <kmilotxm@gmail.com>
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* @author Henrique Moody <henriquemoody@gmail.com>
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* @author Ismael Elias <ismael.esq@hotmail.com>
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* @author Kleber Hamada Sato <kleberhs007@yahoo.com>
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*/
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final class PrimeNumber extends AbstractRule
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{
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/**
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* {@inheritDoc}
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*/
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public function validate($input): bool
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{
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if (!is_numeric($input) || $input <= 1) {
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return false;
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}
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if ($input != 2 && ($input % 2) == 0) {
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return false;
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}
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for ($i = 3; $i <= ceil(sqrt((float) $input)); $i += 2) {
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if ($input % $i == 0) {
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return false;
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}
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}
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return true;
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}
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}
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