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diff --git a/phpBB/phpbb/textformatter/utils_interface.php b/phpBB/phpbb/textformatter/utils_interface.php
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+++ b/phpBB/phpbb/textformatter/utils_interface.php
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+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\textformatter;
+
+/**
+* Used to manipulate a parsed text
+*/
+interface utils_interface
+{
+	/**
+	* Replace BBCodes and other formatting elements with whitespace
+	*
+	* NOTE: preserves smilies as text
+	*
+	* @param  string $text Parsed text
+	* @return string       Plain text
+	*/
+	public function clean_formatting($text);
+
+	/**
+	* Get a list of quote authors, limited to the outermost quotes
+	*
+	* @param  string   $text Parsed text
+	* @return string[]       List of authors
+	*/
+	public function get_outermost_quote_authors($text);
+
+	/**
+	* Remove given BBCode and its content, at given nesting depth
+	*
+	* @param  string  $text        Parsed text
+	* @param  string  $bbcode_name BBCode's name
+	* @param  integer $depth       Minimum nesting depth (number of parents of the same name)
+	* @return string               Parsed text
+	*/
+	public function remove_bbcode($text, $bbcode_name, $depth = 0);
+
+	/**
+	* Return a parsed text to its original form
+	*
+	* @param  string $text Parsed text
+	* @return string       Original plain text
+	*/
+	public function unparse($text);
+}