[PHP-DB] Version Upgrade

[Ng Hwee Hwee]

Hi all,

I'm running on PHP 4.2.2 and MySQL 3.23.54

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I would like to do an upgrade... What would be the highest version number that I can 
upgrade to without causing any possible conflict?

I'm thinking of upgrading to PHP 4.2.3 and MySQL 4.0.4 because they have some features 
that I need.

But I will like to be more adventurous so will PHP 4.2.3 and MySQL 4.1 be advisable?

Many thanks,
Hwee Hwee