sanitize_file_name( string $filename )

function sanitize_file_name( $filename ) {
	$filename_raw = $filename;
	$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", "%", "+", chr(0));

	// Check for support for utf8 in the installed PCRE library once and store the result in a static.
	static $utf8_pcre = null;
	if ( ! isset( $utf8_pcre ) ) {
		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
		$utf8_pcre = @preg_match( '/^./u', 'a' );
	}

	if ( ! seems_utf8( $filename ) ) {
		$_ext     = pathinfo( $filename, PATHINFO_EXTENSION );
		$_name    = pathinfo( $filename, PATHINFO_FILENAME );
		$filename = sanitize_title_with_dashes( $_name ) . '.' . $_ext;
	}

	if ( $utf8_pcre ) {
		$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );
	}

	/**
	 * Filters the list of characters to remove from a filename.
	 *
	 * @since WP-2.8.0
	 *
	 * @param array  $special_chars Characters to remove.
	 * @param string $filename_raw  Filename as it was passed into sanitize_file_name().
	 */
	$special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
	$filename = str_replace( $special_chars, '', $filename );
	$filename = str_replace( array( '%20', '+' ), '-', $filename );
	$filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
	$filename = trim( $filename, '.-_' );

	if ( false === strpos( $filename, '.' ) ) {
		$mime_types = wp_get_mime_types();
		$filetype = wp_check_filetype( 'test.' . $filename, $mime_types );
		if ( $filetype['ext'] === $filename ) {
			$filename = 'unnamed-file.' . $filetype['ext'];
		}
	}

	// Split the filename into a base and extension[s]
	$parts = explode('.', $filename);

	// Return if only one extension
	if ( count( $parts ) <= 2 ) {
		/**
		 * Filters a sanitized filename string.
		 *
		 * @since WP-2.8.0
		 *
		 * @param string $filename     Sanitized filename.
		 * @param string $filename_raw The filename prior to sanitization.
		 */
		return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
	}

	// Process multiple extensions
	$filename = array_shift($parts);
	$extension = array_pop($parts);
	$mimes = get_allowed_mime_types();

	/*
	 * Loop over any intermediate extensions. Postfix them with a trailing underscore
	 * if they are a 2 - 5 character long alpha string not in the extension whitelist.
	 */
	foreach ( (array) $parts as $part) {
		$filename .= '.' . $part;

		if ( preg_match("/^[a-zA-Z]{2,5}\d?$/", $part) ) {
			$allowed = false;
			foreach ( $mimes as $ext_preg => $mime_match ) {
				$ext_preg = '!^(' . $ext_preg . ')$!i';
				if ( preg_match( $ext_preg, $part ) ) {
					$allowed = true;
					break;
				}
			}
			if ( !$allowed )
				$filename .= '_';
		}
	}
	$filename .= '.' . $extension;
	/** This filter is documented in wp-includes/formatting.php */
	return apply_filters('sanitize_file_name', $filename, $filename_raw);
}