SwitchUserViewHelper.php

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

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

    public function render(\TYPO3\CMS\Beuser\Domain\Model\BackendUser $backendUser, $emulate = FALSE) {
        if ($backendUser->getUid() == $GLOBALS['BE_USER']->user['uid']) {
            return '';
        }
        $title = \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate(($emulate ? 'switchBackMode' : 'changeToMode'), 'beuser');
        return '<a href="' . htmlspecialchars(\TYPO3\CMS\Core\Utility\GeneralUtility::linkThisScript(array('SwitchUser' => $backendUser->getUid(), 'switchBackUser' => $emulate))) . '" target="_top" title="' . htmlspecialchars($title) . '">' . \TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIcon(('actions-system-backend-user-' . ($emulate ? 'emulate' : 'switch'))) . '</a>';
    }

}