wp_parse_slug_list( array|string $list )

function wp_parse_slug_list( $list ) {
	if ( ! is_array( $list ) ) {
		$list = preg_split( '/[\s,]+/', $list );
	}

	foreach ( $list as $key => $value ) {
		$list[ $key ] = sanitize_title( $value );
	}

	return array_unique( $list );
}