Correct path to get into a folder outside the www server using php and linux

Question

I have a program in php on a linux server and wanted to know how it is possible to access an element that is outside the www folder. for example, I have the www folder and a folder for my project where I have my main index.php page

but I have the following directory

/var 
  /www
     /Projeto
       /index.php

and at the same level of the folder www I have a folder called spool and another called images.

getting

/var
   /spool
      /imagens

how can I reference the path of an image from within my php application by having access to an image from the images folder for example? currently use a string strcaminho, which gets the following value

strcaminho= "/var/spool/images/logo.png";

but I cannot access, which is the correct way to get the file path out of my www folder according to the folders?