pohopo wrote: With 6 in the works is PHP going to do something so it is 100% backwards compatible with PHP 4 sites?
Absolutely not. Several features which exist in PHP4 (and earlier) will be permanently unconditionally removed in PHP6.
PHP6 will also disable some things which were on by default in PHP5 (magic quotes) and commonly used (register globals).
Essentially, there is a lot of old, bad code out there and the PHP developers want people to upgrade it.
Additionally the PHP4-compatible OO hack in PHP5 is going to be removed (as it was of limited use anyway)
Mark