?debug=1              ?_debug=true           ?debug_mode=1
?XDEBUG_SESSION_START ?XDEBUG_SESSION=1      ?debugbar=1
?profiler=1           ?trace=1               ?verbose=1
?show_errors=1        ?display_errors=1      ?dev_mode=1
?phpinfo=1            ?error_reporting=E_ALL ?env=dev
?env=staging          ?env=pre               ?env=sandbox
?environment=dev      ?staging=1             ?beta=1
?internal=1           ?test=1                ?admin=1