What is the main difference between PHP4 and PHP5?

Hi there Shrreecaterers,

and a warm welcome to these forums. ;)

I will give you the benefit of the doubt with regard to your question,.

So I can only say that I am unable to answer it. :confused:

What I can say, though is that both are now unsupported and that
the latest version is now 8.0.3 - 04 Mar 2021.

Further Reading:-

PHP - Currently Supported Versions

PHP - Unsupported Branches

I trust that this will help.

coothead