EllisLab/CodeIgniter — pull request #1759 by Lefters (2012-09-02 13:42:36+00:00)
Title: (Issue #1742) print_debugger() now accepts three optional parameters to decide what the function returns

The function now accepts three boolean parameters for: header, subject
and body (including attachment data). The user can decide what
combination of the above the function should return. The parameters all
have a default value of TRUE, so it is fully backwards compatible with
the previous version of the function.