66 lines
1.5 KiB
PHP
66 lines
1.5 KiB
PHP
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<?php
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/*
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* This file is part of Respect/Validation.
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*
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* (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
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*
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* For the full copyright and license information, please view the LICENSE file
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* that was distributed with this source code.
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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 abs;
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use function is_integer;
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use function is_numeric;
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/**
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* Validates if the input is a factor of the defined dividend.
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*
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* @author Danilo Correa <danilosilva87@gmail.com>
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* @author David Meister <thedavidmeister@gmail.com>
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* @author Henrique Moody <henriquemoody@gmail.com>
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*/
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final class Factor extends AbstractRule
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{
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/**
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* @var int
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*/
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private $dividend;
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/**
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* Initializes the rule.
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*/
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public function __construct(int $dividend)
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{
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$this->dividend = $dividend;
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}
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/**
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* {@inheritDoc}
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*/
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public function validate($input): bool
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{
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// Every integer is a factor of zero, and zero is the only integer that
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// has zero for a factor.
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if ($this->dividend === 0) {
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return true;
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}
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// Factors must be integers that are not zero.
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if (!is_numeric($input) || (int) $input != $input || $input == 0) {
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return false;
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}
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$input = (int) abs((int) $input);
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$dividend = (int) abs($this->dividend);
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// The dividend divided by the input must be an integer if input is a
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// factor of the dividend.
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return is_integer($dividend / $input);
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}
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}
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