I dunno; I started with PHP 5 (actually, I think I started in late PHP 4), and I've only been happy with the changes as it's evolved.
The only one that's caused me any significant stress is the deprecation of the old `mysql` DB interface; I had to refactor a whole bunch of code for that, since I'm maintaining a codebase that's been in continuous use & development since 2001.
The additions to PHP since 5 add more things you can do, but they don't really change the simple things you can do to first learn PHP. You can still just create a .php file and start interspersing HTML and <?php script tags with basic operations.
The only one that's caused me any significant stress is the deprecation of the old `mysql` DB interface; I had to refactor a whole bunch of code for that, since I'm maintaining a codebase that's been in continuous use & development since 2001.
The additions to PHP since 5 add more things you can do, but they don't really change the simple things you can do to first learn PHP. You can still just create a .php file and start interspersing HTML and <?php script tags with basic operations.