Realized that my knowledge of HTML is completely inadequate and more background reading is required. Then I realized that my knowledge of CSS is completely non-existent. Even more reading. Achievement may be measured by the strength of one's optical prescription. That is a depressing thought.
I managed to tidy up the format of my disk-usage monitoring web page via work-arounds instead of using conventional solutions.
Still no time to further investigate the explode function.
I found a problem when sorting the contents of one of my databases. This was solved by setting one of the Linux locale environment variables. Now I need to update the contents of my documentation database. What has this got to do with music? I hear you say. A very good question. One step forwards, three steps back.
Updated database and just installed wireshark on one of the linux machines
Result! The explode function works as advertised. I was misusing it the other day, and I don't even need to call it when using the exec function to process a file containing 2 columns of data stored in a variable. Now only two steps back, but these steps are giant steps.