We recently updated the PHP runtime versions to 5.5.38, 5.6.24, and 7.0.9 to address a security vulnerability. We have also installed, and enabled by default, the recently released PHP 7.0 driver for SQL Server. This means that customers who are using PHP 7.0 can now connect to SQL Server or Azure SQL Database from their Azure App Service applications.
To aid in debugging PHP applications, we've also updated the version of XDebug to 2.4.0. It's available on the workers under the d:\devtools\xdebug folder and can be enabled via the system-level PHP settings.