Fractional Indexing

This is based on Implementing Fractional Indexing by David Greenspan .

Fractional indexing is a technique to create an ordering that can be used for Realtime Editing of Ordered Sequences.

This implementation includes variable-length integers, and the prepend/append optimization described in David's article.

This implementation was based on the JS Implementation from rocicorp.

Installation

$ composer install arcweave/fractional-indexing

Other Languages

This is a PHP port of the original JavaScript implementation by @rocicorp. That means that this implementation is byte-for-byte compatible with:

Language	Repo
JavaScript	https://github.com/rocicorp/fractional-indexing
Go	https://github.com/rocicorp/fracdex
PHP	https://github.com/rocicorp/fractional-indexing