TypoScriptService.php

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<?php
namespace TYPO3\CMS\Extbase\Service;

class TypoScriptService implements \TYPO3\CMS\Core\SingletonInterface {

    public function convertTypoScriptArrayToPlainArray(array $typoScriptArray) {
        foreach ($typoScriptArray as $key => $value) {
            if (substr($key, -1) === '.') {
                $keyWithoutDot = substr($key, 0, -1);
                $typoScriptNodeValue = isset($typoScriptArray[$keyWithoutDot]) ? $typoScriptArray[$keyWithoutDot] : NULL;
                if (is_array($value)) {
                    $typoScriptArray[$keyWithoutDot] = $this->convertTypoScriptArrayToPlainArray($value);
                    if (!is_null($typoScriptNodeValue)) {
                        $typoScriptArray[$keyWithoutDot]['_typoScriptNodeValue'] = $typoScriptNodeValue;
                    }
                    unset($typoScriptArray[$key]);
                } else {
                    $typoScriptArray[$keyWithoutDot] = NULL;
                }
            }
        }
        return $typoScriptArray;
    }

    public function convertPlainArrayToTypoScriptArray(array $plainArray) {
        $typoScriptArray = array();
        foreach ($plainArray as $key => $value) {
            if (is_array($value)) {
                if (isset($value['_typoScriptNodeValue'])) {
                    $typoScriptArray[$key] = $value['_typoScriptNodeValue'];
                    unset($value['_typoScriptNodeValue']);
                }
                $typoScriptArray[$key . '.'] = $this->convertPlainArrayToTypoScriptArray($value);
            } else {
                $typoScriptArray[$key] = is_null($value) ? '' : $value;
            }
        }
        return $typoScriptArray;
    }
}