Thank you very much because your post helped me incredibly in order to do this. I'll tell you even more because your post encouraged me to study this industry. I started watching video tutorials and studying various courses, for example CodeIgniter Tutorial Videos CI Version 4 . By the way, I can highly recommend it to you.

1. Have a table in your database storing all the entries you want the search engine to crawl in
2. Create a web service in CodeIgniter which executes an SQL query with the LIKE operator to search for relevant results