I'm having trouble getting PHP to use Microsoft's sqlsrv extension on 64bit Windows server 2012 R2 running IIS and PHP 7.1.7. When I run phpinfo() I don't see that the extension has been loaded. I'm assuming I should be looking for sqlsrv as the the extension name. There is also no error in the PHP error log of any sort of failure loading the extension.

I downloaded version 4.3 of the Microsoft's drivers which state they are compatible with PHP 7.1. I have copied the dll files into the PHP\v7.1\ext directory. I added the following lines to the php.ini file.


I have verified that my php.ini file is being read by intentionally misspelling one of the dll names and seeing a corresponding error in the php log.

SQL Server Native Client 10 and 11 is installed.

I have recycled the application pool, restarted the W3SVC service, and restarted the server.

I'm hoping someone here can offer some other things to try.

  • For some reason the error log was not showing any errors when trying to load the extension. I changed the log file name and found the following error. [29-Nov-2017 16:22:20 UTC] PHP Warning: PHP Startup: Unable to load dynamic library 'C:\Program Files\PHP\v7.1\ext\php_sqlsrv_7_nts_x64.dll' - The specified procedure could not be found. in Unknown on line 0 – chump Nov 29 '17 at 16:27
  • Add your new info directly in your question instead of a comment. – Patrick Mevzek Nov 29 '17 at 19:07

The first problem, which I haven't solved yet is my php error log isn't showing extension loading issues unless I change the log file name. After changing the log file name I received the following error:

PHP Warning: PHP Startup: Unable to load dynamic library 'C:\Program Files\PHP\v7.1\ext\php_pdo_sqlsrv_7_nts_x64.dll' - The specified procedure could not be found.

As it turns out I needed to use the driver specific to PHP 7.1. I'm not sure why, by my original download didn't include the 7.1 drivers. Perhaps I mistakenly downloaded the sqlsrv 4.0 driver my first time around. I went and downloaded the sqlsrv 4.3 driver here:


I added the following to my php.ini


sqlsrv extenion is loaded now. I hope this helps someone else.

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