NumberViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Format;

/*
 * 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!
 */

use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

class NumberViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    protected $escapeChildren = false;

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('decimals', 'int', 'The number of digits after the decimal point', false, '2');
        $this->registerArgument('decimalSeparator', 'string', 'The decimal point character', false, '.');
        $this->registerArgument('thousandsSeparator', 'string', 'The character for grouping the thousand digits', false, ',');
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $decimals = $arguments['decimals'];
        $decimalSeparator = $arguments['decimalSeparator'];
        $thousandsSeparator = $arguments['thousandsSeparator'];

        $stringToFormat = $renderChildrenClosure();
        return number_format($stringToFormat, $decimals, $decimalSeparator, $thousandsSeparator);
    }
}