Can I run several versions of PHP at the same time?
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10.1 General Information
10 FAQ : Foire Aux Questions
 Manuel PHP
. What is PHP?
. What does PHP stand for?
. What is the relation between the versions?
. Can I run several versions of PHP at the same time?
->What are the differences between PHP 3 and PHP 4?
.  I think I found a bug! Who should I tell?

10.1.5 What are the differences between PHP 3 and PHP 4?

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, also read the related appendix .

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