Php version with WP

CMS & WordPress
1

I have installed WP version 3.0.1 with php version (1) and want to install new version(2) as following:
1.Current Version
PHP: Version 4.3.3
Perl: Version 5.8.0
API Php MySQL: Version 4.0.15a

2New Version
PHP: Version 5.2.5
Perl: Version 5.8.8
API Php MySQL: Version 5.0.45

will it effect my website and web content?

2

Version 2 sounds much closer to what Wordpress is currently designed to work with so any impact of the change should be improved processing times.

3

But, I am scared that it may down my website. If I take back up of wp-content
folder and database and install new version of php and then reload it. Will my website work properly?

Thanks

4

Yes that would be the safest way. Of course you really ought to have done that two years ago when PHP 4 was declared to be dead.

5

Ha ha ha, you are right sir, In fact, I am working for a company who develops websites and there was one website that I redeveloped in wordpress and that was developed in php 5 years ago. I am brand new guy in web development specialy in open source technology. I was working in ASP.NET.

Thanks for your kind support