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I'm interested in creating tiny url like links. My idea was to simply store an incrementing identifier for every long url posted and then convert this id to it's base 36 variant, like the following in PHP:
$tinyurl = base_convert($id, 10, 36)
The problem here is that the result is guessable, while it has to be hard to guess what the next url is going to be, while still being short (tiny). Eg. atm if my last tinyurl was a1, the next one will be a2. This is a bad thing for me.
So, how would I make sure that the resulting tiny url is not as guessable but still short?