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typo3conf/ext/vhs/Classes/ViewHelpers/Random/StringViewHelper.php

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+<?php
+namespace FluidTYPO3\Vhs\ViewHelpers\Random;
+
+/*
+ * This file is part of the FluidTYPO3/Vhs project under GPLv2 or later.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.md file that was distributed with this source code.
+ */
+
+use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
+
+/**
+ * ### Random: String Generator
+ *
+ * Use either `minimumLength` / `maximumLength` or just `length`.
+ *
+ * Specify the characters which can be randomized using `characters`.
+ *
+ * Has built-in insurance that first character of random string is
+ * an alphabetic character (allowing safe use as DOM id for example).
+ *
+ * @author Claus Due <claus@namelesscoder.net>
+ * @package Vhs
+ * @subpackage ViewHelpers\Random
+ */
+class StringViewHelper extends AbstractViewHelper {
+
+	/**
+	 * @param integer $length
+	 * @param integer $minimumLength
+	 * @param integer $maximumLength
+	 * @param string $characters
+	 * @return string
+	 */
+	public function render($length = NULL, $minimumLength = 32, $maximumLength = 32, $characters = '0123456789abcdef') {
+		$minimumLength = intval($minimumLength);
+		$maximumLength = intval($maximumLength);
+		$length = ($minimumLength != $maximumLength ? rand($minimumLength, $maximumLength) : ($length !== NULL ? $length : $minimumLength));
+		$string = '';
+		for ($i = 0; $i < $length; $i++) {
+			$randomIndex = mt_rand(0, strlen($characters) - 1);
+			$string .= $characters{$randomIndex};
+		}
+		return $string;
+	}
+
+}