[PHP] Which hashing algorithm is best to check file duplicity?

[Martin Zvarík]

I want to store the file's hash to the database, so I can check next 
time to see if that file was already uploaded (even if it was renamed).

What would be the best (= fastest + small chance of collision) algorithm 
in this case?

Is crc32 a good choice?

Thank you in advance,
Martin

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