PHP code to make something appear on all pages of a website

Hello!

I’m currently building my own personal website, and would like to have the same elements on each page. I’m not sure if linking to my site is allowed here, but here it is.

While so far all I have is the contact page (which in itself I don’t like that after filling out the form, before the thankyou page displayes, you visibly see the form being validated). But as you can see, I have a section on the far right called Fun-Filled Links, which I’d like to populate daily with fun stuff I found on the sites currently mentioned. However, updating each page of my site would be inefficient.

Isn’t there a php coding that would take care of this for me? I used to dabble in PHP and thought there was, but I’ve forgotten the coding.

Thank you!

[SIZE=1]PS - If website linking is not allowed here (and I tried to find rules before posting to be sure) please just remove my link above.[/SIZE]