FPDF - Dynamically Set XY Value

Hello Experts,
I am fairly new to programming. I would consider myself a hobbyist...

I have an HTML form, which, upon submission, creates a PDF (using FPDF). The majority of the PDF contains static text. However, there are two portions of the PDF which contain the text from the user's input. I would like the position of the static text to change dynamically, based off how big or small each user input section is. I am trying to prevent the dynamic text from overlapping the static text. So, I want to learn how to set the XY values of the static text, based off the end XY values of the dynamic text, if that makes sense. 

Example:

Static text...Static Text

Dynamic Text from User Input

More Static Text...More Static Text

Dynamic Text from User Input

Yet Even More Static Text...Yet Even More Static Text