php-debugbar/docs/storage.md

Storage

DebugBar supports storing collected data for later analysis. You'll need to set a storage handler using setStorage() on your DebugBar instance.

$debugbar->setStorage(new DebugBar\Storage\FileStorage('/path/to/dir'));

Each time DebugBar::collect() is called, the data will be persisted.

Available storage

Only file storage is provided at the moment. It will collected data as json files under the specified directory (which as to be writable).

$storage = new DebugBar\Storage\FileStorage($directory);

Creating your own storage

You can easily create your own storage handler by implementing the DebugBar\Storage\StorageInterface.

Request ID generator

For each request, the debug bar will generate a unique id under which to store the collected data. This is perform using a DebugBar\RequestIdGeneratorInterface object.

If none are defined, the debug bar will automatically use DebugBar\RequestIdGenerator which uses the $_SERVER array to generate the id.