The message parsers have recently being added to support more custom log format in phplogcon.
If you take a look to the "Message Parsers" panel in the Admin Center of phpLogCon, you will notice the question mark icons. Some of them are linked to Howto Articles which explain how to setup these message parsers. This would be a good start to get into them.
You also see the "Message Parser ID" in this Panel, these ID's have to be entered in the "Message Parsers (comma seperated)" of your logstream sources. I hope this helps

best regards,
Andre Lorbach
PS: Btw I would recommend at least phpLogCon 2.5.14 or better higher, because prior Version did not have the "Message Parsers" admin panel.