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Editorial Team
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Asked: 2026-06-06T19:38:08+00:00

Considering that the two machine’s time settings are not synced, is it still possible

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Considering that the two machine’s time settings are not synced, is it still possible to run a PHP script (for example) in each of them and they will still generate the same random code when run every x hours?

For example:

If I run the script in server A on 1PM it will return “random182”.
If I run the script in server B on 1PM it will return “random182”.

If I run the script in server A on 2PM it will return “random747”.
If I run the script in server B on 2PM it will return “random747”.

If it’s possible, how and what sort of functions should I be looking at?

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1 Answer

  1. Editorial Team

    The machines need a common initialisation vector (IV) for their pseudo-random sequence.

    Classically this is system time (if security is unimportant). So:

    • synchronise your time e.g. ntp (at an app or machine level)
    • or pass in the IV to your script when you call it, i.e. the callee is saying what the IV is
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