Can I be assured the following code generates a unique cookie id in a mod_perl environment?

Nope.

For example, it's perfectly feasible that two requests could be processed in under a second on a single Apache process, and the same random number come up twice.

Also, since you're not separating the values you use with a delimiter you can get the same string from different values, e.g.:

$ToBase62->(time) $ToBase62->($$) ToBase62->( rand($$))
1234 567 89
12345 678 9

both give the same ID.

Personally I tend to use Data::UUID for creating unique IDs.

In reply to Re: unique cookie id? by adrianh
in thread unique cookie id? by rkg

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