IntegerValidator.php

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<?php
namespace TYPO3\CMS\Form\Domain\Validator;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class IntegerValidator extends AbstractValidator
{
    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_integer';

    public function isValid($value)
    {
        $locale = localeconv();
        $valueFiltered = str_replace(
            [
                $locale['thousands_sep'],
                $locale['mon_thousands_sep'],
                $locale['decimal_point'],
                $locale['mon_decimal_point']
            ],
            [
                '',
                '',
                '.',
                '.'
            ],
            $value
        );
        if (strval((int)$valueFiltered) != $valueFiltered) {
            $this->addError(
                $this->renderMessage(
                    $this->options['errorMessage'][0],
                    $this->options['errorMessage'][1],
                    'error'
                ),
                1442000119
            );
        }
    }
}