UpperCaseFilter.php

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<?php
namespace TYPO3\CMS\Form\Filter;

class UpperCaseFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    public function filter($value) {
        return $GLOBALS['TSFE']->csConvObj->conv_case($GLOBALS['TSFE']->renderCharset, $value, 'toUpper');
    }

}