In a quick new post on Chris Shiflett's blog today, he takes a look at the adoption of PHP5 and its slow rate of adoption.

There seems to be a growing amount of interest within the PHP community about the slow rate of PHP 5's adoption. Call me crazy, but I tend to think of this as a testament of PHP's success, because it might mean:

• PHP 4 suits many people's needs, so there's no pressing reason for them to upgrade (think about Apache 1.3).
• PHP is being used in environments where upgrading is a very controlled process (Yahoo, for example).

He also suggests that there will come a "tipping point" where the gates will open and PHP5 usage will rise dramatically. He also suggests the book Upgrading to PHP5 as a good reference on how to make the switch...