翻译PHP文档

I have a large PHP Document in the following format:

<?php

define("TITLE","HAPPY DAYS");
define("FOOTER","This site is ok");
... 1000 more
?>

I want to translate it to Spanish.
I tried Google translate but it also translated TITLE , FOOTER which are PHP keywords and should be not translated.

Any idea how to automate it?

If my call is

API?text="TEXT HERE"

it returns

TEXT TRANSLATED

I would suggest two ways which i would prefer

Method 1 : ->Manually

You can have a table like this

S.No | Text      | French_Text  | Spanish_Text
   1 | KNowledge | Connaissance | Conocimiento

So You will give the english value by default, then if the user chooses the some language you can set a cookie or some storage locally,

And in the header page according to the selection you will refer the French_Text or Spanish_Text. You can have as many language like this.

Or you can go to any api

Method 2 : -> Using some api

You can select an api which allows to translate with respect to div or class. So that you can have translation for the particular area that you need.