Luku 44. General Information

1. What is PHP?
2. What does PHP stand for?
3. What is the relation between the versions?
4. Can I run several versions of PHP at the same time?
5. What are the differences between PHP 3 and PHP 4?
6. I think I found a bug! Who should I tell?

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 .