UsernameViewHelper.php

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<?php
namespace TYPO3\CMS\Belog\ViewHelpers;

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

    protected $backendUserRepository;

    static protected $usernameRuntimeCache = array();

    public function render($uid) {
        if (isset(static::$usernameRuntimeCache[$uid])) {
            return htmlspecialchars(static::$usernameRuntimeCache[$uid]);
        }

        $user = $this->backendUserRepository->findByUid($uid);
        // $user may be NULL if user was deleted from DB, set it to empty string to always return a string
        static::$usernameRuntimeCache[$uid] = ($user === NULL) ? '' : $user->getUserName();
        return htmlspecialchars(static::$usernameRuntimeCache[$uid]);
    }

}