To get started with XHGUI you'll need to collect some profiling data.
The simplest way to get an application profiled, is to use external/header.php.
This file is designed to be combined with PHP's
auto_prepend_file
directive. This can be enabled system-wide through php.ini. Alternatively, you can enable
auto_prepend_file per virtual host. See the README.md file for more details.