JsonEncodeViewHelper.php

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<?php
namespace TYPO3\CMS\Extensionmanager\ViewHelpers\Format;

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

    public function __construct() {
        $this->registerArgument('additionalAttributes', 'array', 'Additional tag attributes. They will be added directly to the resulting HTML tag.', FALSE);
    }

    public function render() {
        if ($this->hasArgument('additionalAttributes') && is_array($this->arguments['additionalAttributes'])) {
            return json_encode($this->arguments['additionalAttributes']);
        }
        $content = $this->renderChildren();
        return json_encode($content);
    }

}