ErrorIconViewHelper.php

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

class ErrorIconViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Be\AbstractBackendViewHelper {

    public function render($errorNumber = 0) {
        $errorSymbols = array(
            '0' => '',
            '1' => \TYPO3\CMS\Backend\Template\DocumentTemplate::STATUS_ICON_WARNING,
            '2' => \TYPO3\CMS\Backend\Template\DocumentTemplate::STATUS_ICON_ERROR,
            '3' => \TYPO3\CMS\Backend\Template\DocumentTemplate::STATUS_ICON_ERROR
        );
        return $this->getDocInstance()->icons($errorSymbols[$errorNumber]);
    }

}