How to upgrade PHP?

I currently run PHP 4.2.2 on my Ensim server (I got this server a very long time ago) and I think it's about time I upgrade the PHP version since hardly anything works on 4.2.2 anymore.

Anyway, is there an easy way to upgrade the PHP version?

I'm a total beginner here when it comes to this so if someone could point me to the right place with instructions, I would really appreciate it How to upgrade PHP?

 

 

 

 

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