php-debugbar/docs/data_formatter.md

Data Formatter

An instance of DebugBar\DataFormatter\DataFormatterInterface is used by collectors to format data.

The default instance is DebugBar\DataFormatter\DataFormatter. This can be modified using DebugBar\DataCollector\DataCollector::setDefaultDataFormatter().

You can use a custom formater for each collector using DataCollector::setDataFormatter().