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Classes/ViewHelpers/Backend/IsStringViewHelper.php

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+<?php
+namespace WapplerSystems\Meilisearch\ViewHelpers\Backend;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2017 Rafael Kähm <rafael.kaehm@dkd.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractConditionViewHelper;
+
+/**
+ * Condition for checking if type is a string.
+ */
+class IsStringViewHelper extends AbstractConditionViewHelper
+{
+
+    /**
+     * Initialize ViewHelper arguments
+     *
+     * @return void
+     */
+    public function initializeArguments()
+    {
+        parent::initializeArguments();
+        $this->registerArgument('value', 'mixed', 'Value to be verified.', true);
+    }
+
+    /**
+     * This method decides if the condition is true or false
+     *
+     * @param array $arguments ViewHelper arguments to evaluate the condition for this ViewHelper.
+     * @return bool
+     */
+    protected static function evaluateCondition($arguments = null)
+    {
+        return (isset($arguments['value']) && is_string($arguments['value']));
+    }
+}