| What does PHP stand for? <<<  | 
What is the relation between the versions? | Can I run several versions of PHP at the same time? >>>  | 
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?  | 
10.1.3 What is the relation between the versions?
 PHP/FI 2.0 is an early and no longer supported version of PHP. PHP 3 is the successor to PHP/FI 2.0 and is a lot nicer. PHP 4 is the current generation of PHP, which uses the Zend engine under the hood. PHP 5 uses Zend engine 2 which, among other things, offers many additional OOP features. PHP 5 is experimental.  | 
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| What does PHP stand for? | General Information | Can I run several versions of PHP at the same time? |