What are the differences between PHP 3 and PHP 4?
ARTICLE # 58
ADDED ON 18th Apr,2008
URL http://demos1.softbiz.com/scripts/seofaq/category/PHP_Only/What_are_the_differences_between_PHP_3_and_PHP.htm

There are ? a couple of articles written on this by the authors of PHP 4. Here's a list of some of the more important new features:

  • Extended API module
  • Generalized build process under UNIX
  • Generic web server interface that also supports multi-threaded web servers
  • Improved syntax highlighter
  • Native HTTP session support
  • Output buffering support
  • More powerful configuration system
  • Reference counting

Please see the ? What's new in PHP 4 overview for a detailed explanation of these features and more. If you're migrating from PHP 3 to PHP 4