Upgrade XHProf to 2.2.3

Install the tideways_xhprof PHP extension

Install the tideways extension for PHP7, see https://github.com/tideways/php-profiler-extension for Installation instructions. Or if you're on Ubuntu/LinuxMint, follow the instructions below

Ubuntu/LinuxMint install instructions

1. Update your system

   sudo apt update && sudo apt upgrade -y

2. Download the precompiled tideways_xhprof extension installer for Debian-based systems:

   wget https://github.com/tideways/php-xhprof-extension/releases/download/v5.0.4/tideways-xhprof_5.0.4_amd64.deb

3. Install the package

   sudo dpkg -i tideways-xhprof_5.0.4_amd64.deb

4. Check your PHP version

   php -v

5. Check the contents of /usr/lib/tideways_xhprof

   ls /usr/lib/tideways_xhprof

6. Make sure that there is a .so file that matches your current PHP version. For example, if you're on PHP 7.4, then confirm that tideways_xhprof-7.4.so is available in that folder.
7. Using your favourite editor, create a "tideways_xhprof.ini" under /etc/php/[YOUR_PHPVERSION]/mods-available. e.g. if you're on PHP 7.4 on LinuxMint with xed as the editor:

   sudo xed /etc/php/7.4/mods-available/tideways_xhprof.ini

8. Paste the following line in tideways_xhprof.ini pointing to the path of the tideways_xhprof extension file matching your PHP version.

   extension=/usr/lib/tideways_xhprof/tideways_xhprof-7.4.so

9. Enable the tideways_xhprof extension

   sudo phpenmod tideways_xhprof

10. Install Graphviz. (This is required for generating the callgraph of the profiling run)

    sudo apt install graphviz

11. Restart your webserver

    sudo service apache2 restart

12. Check your phpinfo() page. Search for tideways_xhprof and confirm that it is present.

Test

1. Make sure "Developer mode" is turned on.
2. Go to "Site administration / Development / Profiling"
3. Tick "Enable profiling".
4. Under "Profile these", enter "/index.php"
5. Go to the "Site home".
6. Scroll down to the bottom of the page. Confirm that there is a link named "This script has been profiled"
7. Click the "This script has been profiled" link.
8. Confirm that it loads okay.
9. Click "Export this profiling run"
10. Confirm that a .mpr file archive containing XML files is generated.
11. Click "View profiling details".
12. Confirm that a table of function calls is displayed.
13. Click on "View Full Callgraph"
14. Confirm that the call graph is generated.