Clean file name when uploading in WordPress

mu-sanitize-filename.php

<?php if ( ! defined( 'ABSPATH' ) ) {
	die( 'Restricted Area' );
}

/*
* Plugin Name: Sanitize File Name
* Description: Clean file name when uploading files in WordPress.
* Version: 20240103
* Author: Mickaël Gris (Saipafo) & Aurélien Denis (WP channel)
* Author URI: https://wpchannel.com/wordpress/tutoriels-wordpress/renommer-automatiquement-fichiers-accentues-wordpress/
*/

function wpc_sanitize_french_chars( $filename ) {
	// Force the file name in UTF-8
	$filename = mb_convert_encoding( $filename, "UTF-8" );

	// Remove accents using WordPress function
	$filename = remove_accents( $filename );

	// Additional replacements
	$char_not_clean    = [ '©' ];
	$clean             = [ 'copy' ];
	$friendly_filename = str_replace( $char_not_clean, $clean, $filename );

	// Remove any remaining special characters
	$friendly_filename = preg_replace( '/[^\w\s.-]/u', '', $friendly_filename );

	// Lowercase
	$friendly_filename = strtolower( $friendly_filename );

	return $friendly_filename;
}

add_filter( 'sanitize_file_name', 'wpc_sanitize_french_chars' );

@keroth- : hey thanks!

Big update today using native remove_accents() function! Still need extra checks. Also update tutorial link.