Creating your own Tinyurl style uid

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Why do you want to use a random function? I always assumed that tinyurl used a base 62 (0-9A-Za-z) representation of a sequential Id. No clashes and the urls are always as short as possible.

You would have a DB table like

Id  URL
 1  http://google.com
 2  ...
... ...
156 ...
... ...

and the corresponding URLs would be:

http://example.com/1
http://example.com/2
...
http://example.com/2W
...

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