Today I ran into an error which says "Array and string offset access syntax with curly braces is deprecated".
I had to fix at least /include/upload_functions.php, line 107 from
[code="php"]$last = strtolower($val{strlen($val)-1});[/code]
to
[code="php"]$last = strtolower($val[strlen($val)-1]);[/code]
I guess there's much more in the code to be fixed for newer PHP releases.
Regards, Ulf Dunkel