Problem with parser

Haven't used it myself, but over here https://www.codeigniter.com/userguide3/l...sage-notes looks like you need to set seo_book_title first in array, then follow-ups that might be in the first string after that.

PHP Code:

$data = [
   'seo_book_title' => $SeoBooks->title,
   'site_name' => $ConfigurationSite->name,
   'seo_title' => $ConfigurationSite->title
]; 


No, it doesn't work, I don't know if I've been able to explain myself properly.
I have this stored in my database: "Buy on {site_name}" and I want you to show me on the new label(seo_book_title) what I have in the database, It should work, since site_name is already defined, but it shows text as I have it in the database.