How to solve the permissions issue for file_put_contents()?

Question

ubuntu

The site is located in the folder /var/www/test.site/public_html/
Created a function to add content to the file

function writeDataToFile($data){
    
    if(file_put_contents(ORDERS_LOG, $data, FILE_APPEND)){
      return true;
    }
    return false;
  }

ORDERS_LOG - constant - define('ORDERS_LOG', __DIR__.'/../admin/orders.log');
I am getting an error:

Warning: file_put_contents(/var/www/test.site/public_html/eshop/inc/../admin/orders.log): failed to open stream: Permission denied in /var/www/test.site/public_html/eshop/inc/lib.inc.php on line 136

Set owner and owner group to www folder
sudo chown -R serii:serii www

What else did I forget to do?
Thanks in advance.

Answer 1

It is necessary that the web server user has access to all folders along the path to the file, make sure that this is the case, in this case to the var folder