The Soneso open source Stellar SDK for PHP will provide APIs to build and sign transactions, connect and query Horizon.
Implementation of the Core Functionalty including SEP-029
Implementation of SEP-001, SEP-002, SEP-023, SEP-005, SEP-010, SEP-007, SEP-009, SEP-006, SEP-012, SEP-011
Maintenance and continuous improvement of the sdk