PHP8 Error handling and mitigation

[Phencys]

With the upgrade to PHP8.x, much more strict runtime requirements have been activated as well.

As it seems there is no effictive way to handle runtime failures, other than through a shutdown_function, all data accesses will need to be guarded against undefined accesses.

This includes, but is not limited to:

• Array indices
• DOM element indices
• Parameters to internal PHP functions such as
  • count()
  • array_key_exists()
  • etc...

As an extra precaution, we should look into defining types for all function parameters, as this will greatly decrease the amount of options for failures as well.