FloatValidator.php

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<?php
namespace TYPO3\CMS\Form\Validation;

class FloatValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_float';

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            $locale = localeconv();
            $valueFiltered = str_replace(
                array(
                    $locale['thousands_sep'],
                    $locale['mon_thousands_sep'],
                    $locale['decimal_point'],
                    $locale['mon_decimal_point']
                ),
                array(
                    '',
                    '',
                    '.',
                    '.'
                ),
                $value
            );
            if ($valueFiltered != strval(floatval($valueFiltered))) {
                return FALSE;
            }
        }
        return TRUE;
    }

}