Microsoft announced on 12th April 2016 early technical preview of the Microsoft Driver 4.0.3 for PHP for SQL Server, using this driver you can connect your PHP application with Microsoft SQL Server currently this server is available only for PHP 7. This Driver enable you to access SQL Server, Azure SQL Database and Azure SQL DW from your PHP 7 apps.
Download Driver
Future Plans
Microsoft plan on a Linux port, expand SQL 16 Feature Support (example: Always Encrypted), build verification/fundamental tests, bug fixes.This early technical preview provide some limited support on this github page here
We hope this add-on will help you in your future development.
Source: https://blogs.msdn.microsoft.com/sqlphp/2016/04/12/early-technical-preview-of-microsoft-drivers-4-0-3-for-php-for-sql-server-released/