AvatarViewHelper.php

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

use TYPO3\CMS\Backend\Backend\Avatar\Avatar;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;

class AvatarViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($backendUser = 0, $size = 32, $showIcon = false)
    {
        return static::renderStatic(
            array(
                'backendUser' => $backendUser,
                'size' => $size,
                'showIcon' => $showIcon
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        if ($arguments['backendUser'] > 0) {
            $backendUser = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('*', 'be_users', 'uid=' . (int)$arguments['backendUser']);
        } else {
            $backendUser = $GLOBALS['BE_USER']->user;
        }
        $avatar = GeneralUtility::makeInstance(Avatar::class);
        return $avatar->render($backendUser, $arguments['size'], $arguments['showIcon']);
    }
}