CropViewHelper.php

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

class CropViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($maxCharacters) {
        if (empty($maxCharacters) || $maxCharacters < 1) {
            throw new \TYPO3\CMS\Install\ViewHelpers\Exception(
                'maxCharacters must be a positive integer',
                1371410113
            );
        }
        $stringToTruncate = $this->renderChildren();
        return substr($stringToTruncate, 0, $maxCharacters);
    }
}