…

…only requires PHP and SQLite, you don't need anything else - no containers, no nothing
…is typo-tolerant (based on the State Set Index Algorithm and Levenshtein)
…supports phrase search using " quotation marks
…supports filtering (and ordering) on any attribute with any SQL-inspired filter statement
…supports filtering (and ordering) on Geo distance
…orders relevance based on a typical TF-IDF Cosine similarity algorithm
…auto-detects languages
…supports stemming
…is very easy to use
…is all-in-all just the easiest way to replace your good old SQL LIKE %...% queries with a way better search experience but without all the hassle of an additional service to manage. SQLite is everywhere and all it needs is your filesystem.