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typo3/sysext/beuser/Classes/ViewHelpers/ArrayElementViewHelper.php

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+<?php
+namespace TYPO3\CMS\Beuser\ViewHelpers;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use TYPO3\CMS\Beuser\Exception;
+use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
+use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;
+
+/**
+ * Get a value from an array by given key.
+ * @internal
+ */
+class ArrayElementViewHelper extends AbstractViewHelper
+{
+    use CompileWithRenderStatic;
+
+    /**
+     * Initializes the arguments
+     */
+    public function initializeArguments()
+    {
+        $this->registerArgument('array', 'array', 'Array to search in', true);
+        $this->registerArgument('key', 'string', 'Key to return its value', true);
+        $this->registerArgument('subKey', 'string', 'If result of key access is an array, subkey can be used to fetch an element from this again', false, '');
+    }
+
+    /**
+     * Return array element by key. Accessed values must be scalar (string, int, float or double)
+     *
+     * @param array $arguments
+     * @param \Closure $renderChildrenClosure
+     * @param RenderingContextInterface $renderingContext
+     * @throws Exception
+     * @return string
+     */
+    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
+    {
+        $array = $arguments['array'];
+        $key = $arguments['key'];
+        $subKey = $arguments['subKey'];
+        $result = '';
+        if (is_array($array) && isset($array[$key])) {
+            $result = $array[$key];
+            if (is_array($result) && $subKey && isset($result[$subKey])) {
+                $result = $result[$subKey];
+            }
+        }
+        if (!is_scalar($result)) {
+            throw new Exception('Only scalar return values (string, int, float or double) are supported.', 1382284105);
+        }
+        return $result;
+    }
+}