@phpdeveloper.org
As most PHP developers (and companies looking at using PHP) can tell from some of the recent stats, PHP5's adoption rate has been pretty slow ever since it was released. A lot of PHP applications have been written to use the PHP 4 series, but most would agree that a move up would be a good thing. So, why haven't they? Denis de Bernardy wonders about this too in his latest blog posting.
If you think php5 is a no brainer choice since it's been around for almost three years now, you might want to think again.
I can find lots of reasons to develop in php5 rather than php4. php5 is closer to what I'd expect from an object oriented language, and it's reportedly 25% faster. Not to mention the pdo class, which is wonderful to work with.
Then again, developing software that 50% of your user base simply cannot use doesn't make any sense.
He backs up the point with some statistics that Semiologic collected recently, showing that the PHP 4.4.x series is a clear winner on usage. If a change that wasn't so dramatic (PHP4 to PHP5) has this kind of effect on the version usage, what kind of adoption rate will we see when PHP 6 comes around?