My thought about php4->php6 migration was that when php6 is out to encourage (or more correctly said almost enforce - with the proper announcement for EOL on the php.net) the php4 users to upgrade directly to php6. This way the php6 adoption could be much faster than php5 one. It will be just obvious for everybody still using php4 that he has to upgrade - then why to upgrade to php5 while he can upgrade to php6? So please give your opinions on this.
I dont think this is a good idea and is unlikely to happen in the real world. IMO we should push users to first get onto PHP5 now that its stable enough to be used, then look at gently nudging users to PHP 6 about a year after its be released. When PHP 6 has been out 3 years look a nudging people running PHP 5 a little harder to migrate. Although AFAICS the unicode implementation issues (see the unicode semantics thread) is likely to be a key issue to get people to migrate up to PHP6 so the less painful it can be made the better. Regards Marco
