(PECL ssdeep >= 1.0.0)
ssdeep_fuzzy_hash — Create a fuzzy hash from a string
ssdeep_fuzzy_hash ( string $to_hash ) : string
 ssdeep_fuzzy_hash() calculates the hash of to_hash using » context-triggered piecewise hashing, and returns that hash. 
to_hash
The input string.
 Returns a string on success, false otherwise. 
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    https://www.php.net/manual/en/function.ssdeep-fuzzy-hash.php