TitleCaseFilter.php

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

use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;

class TitleCaseFilter implements FilterInterface {

    public function filter($value) {
        $tsfe = $this->getTypoScriptFrontendController();
        $lower = $tsfe->csConvObj->conv_case($tsfe->renderCharset, $value, 'toLower');
        return ucwords($lower);
    }

    protected function getTypoScriptFrontendController() {
        return $GLOBALS['TSFE'];
    }
}