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system/Format/FormatterInterface.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Format;
+
+/**
+ * Formatter interface
+ */
+interface FormatterInterface
+{
+    /**
+     * Takes the given data and formats it.
+     *
+     * @param array|string $data
+     *
+     * @return mixed
+     */
+    public function format($data);
+}