wordpress-media-remove-accents.php

<?php
/*
 Plugin Name: Remove accents for WordPress media
 Version: 0.1
 Plugin URI: https://github.com/herewithme/members-post-type
 Description: Remove accents on filename for WordPress attachments
 Author: Amaury Balmer
 Author URI: http://www.beapi.fr
 ----
 
 Inspiration : http://www.geekpress.fr/wordpress/astuce/suppression-accents-media-1903/

 Copyright 2013 Amaury Balmer (amaury@beapi.fr)

 This program 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 2 of the License, or
 (at your option) any later version.

 This program 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.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

// don't load directly
if ( !defined('ABSPATH') ) {
	die('-1');
}

add_filter( 'sanitize_file_name', 'remove_accents', 10, 1 );
add_filter( 'sanitize_file_name_chars', 'sanitize_file_name_chars', 10, 1 );

function sanitize_file_name_chars( $special_chars = array() ) {
	$special_chars = array_merge( array( '’', '‘', '“', '”', '«', '»', '‹', '›', '—', 'æ', 'œ', '€' ), $special_chars );
	return $special_chars;
}