Hello @Tim D
Please try the following to enable the pdo_sqlsrv extension for PHP 7.X on Azure Web Apps:
- Download the extension package for PHP 7 from https://github.com/microsoft/msphpsql/tree/master, unzip for following use.
- Follow the guide of https://azure.microsoft.com/en-us/documentation/articles/web-sites-php-configure/#how-to-enable-extensions-in-the-default-php-runtime to upload DLL libraries and configure in PHP runtime.
- Only for Azure Web Apps Windows (by default, Azure Web App requires X86 with nts version. Please use the libraries in msphpsql-PHP-7.0\binaries\x86 you unzip before, and use php_sqlsrv_7_nts.dll and php_pdo_sqlsrv_7_nts.dll)
- Restart the site after configuring the settings.