Steps to Enable Xdebug for PHP Profiling 

By Yi Wang and Mangesh Sangapu

  1. Find the matching version of xdebug extension from "D:\devtools\xdebug\2.4.0\",for example, if you have PHP 5.6, use "D:\devtools\xdebug\2.4.0\php_5.6\php_xdebug-2.4.0-5.6-vc11-nts.dll".

    To access D: drive, use Kudu <your-website-name>, or "Advanced Tools" in Azure portal,kudu

  2. Add Xdebug extension in Application Settings->App settings:
    PHP_ZENDEXTENSIONS = D:\devtools\xdebug\2.4.0\php_5.6\php_xdebug-2.4.0-5.6-vc11-nts.dll appsettings

  3. Create Xdebug profile output directory "D:\home\site\wwwroot\bin\xdebug_profiles"

  4. Create "D:\home\site\wwwroot\.user.ini", add follow in settings in ".user.ini"


    (Note: To enable Xdebug all the time, set "xdebug.profiler_enable=1", and remove "xdebug.profiler_enable_trigger" )

  5. Trigger Xdebug profiling as "https://<your-site>/<page-name>.php?XDEBUG_PROFILE=1"


Additional Settings 

To append the filename to the xdebug output filename, use the following setting in .user.ini:
xdebug.trace_output_name = cachegrind.out.%s

Specifier  Meaning  Example Format  Example Filename 
%s  script name 2  cachegrind.out.%s  cachegrind.out._home_httpd_html_test_xdebug_test_php


Links to Xdebug Profile Viewers

Wincache Grind



Xdebug Reference Documentation


More reference Troubleshooting PHP Performance in Microsoft Azure Web Sites with Xdebug