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diff --git a/phpBB/phpbb/textformatter/acp_utils_interface.php b/phpBB/phpbb/textformatter/acp_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;
+
+interface acp_utils_interface
+{
+	/**
+	* Analyse given BBCode definition for issues and safeness
+	*
+	* Required elements in the return array:
+	*  - status:
+	*    - "safe"               The BBCode is valid and can be safely used by anyone.
+	*    - "unsafe"             The BBCode is valid but may be unsafe to use.
+	*    - "invalid_definition" There is an issue with the definition.
+	*    - "invalid_template"   There is an issue with the template.
+	*
+	* Optional elements in the return array:
+	*  - name:       Name of the BBCode based on the definition. Required if status is "safe".
+	*  - error_text: Textual description of the issue in plain text or as a L_* string.
+	*  - error_html: Visual description of the issue in HTML.
+	*
+	* @param  string $definition BBCode definition, e.g. [b]{TEXT}[/b]
+	* @param  string $template   BBCode template, e.g. <b>{TEXT}</b>
+	* @return array
+	*/
+	public function analyse_bbcode(string $definition, string $template): array;
+}