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http://www.vidyasocks.com/forums.php?id=1&id=1
as you can see at the bottom I am using hash as a way to identify users. How can I trim off the rest after 10 characters?
Trimming runs the risks of hash collisions where two users potentially share the same trimmed portion.
http://en.wikipedia.org/wiki/Collision_(computer_science)
Hashing algorithms go to great length to avoid this possibility so modification of the hashed results in any way is not recommended.