How to steal a file from a server?

Question

PHP

Hello. I need to make a calculator like this:
https://petsci.co.uk/bmi/bmi.html
It sends the collected data to this address:
https://petsci.co.uk/bmi/bmi.php
Can I do something like that steal or download this file to find out what formulas are used for calculations?

Answer 1

Comrade Major, re-login

Answer 2

Rogue, don't steal!

Answer 3

https://ru.wikipedia.org/wiki/%D0%98%D0%BD%D0%B4%D...
But I don’t know where you will take tables for interpreting the results depending on the breed and sex of the dog.

Answer 4

For starters, you can go to the "everything for the house" store and buy scrap.