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Asked: 2026-05-11T02:06:35+00:00

Sorry if this is a comp-sci 101 question. I’m just unsure if I’m missing

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Sorry if this is a comp-sci 101 question. I’m just unsure if I’m missing something obvious.

So let’s say some user input throws an error, and I want to catch it and return some feedback. The error will be a number, 0 – 8. 0 means ‘No Error’. I want to give the user very specific feedback if the error is 3 (No numbers allowed, let’s say). For the other 7 possibilities, I just want to end the script and echo the error.

I was working this out and decided to go with this:

$no_errors ($_error != 0 || $_error != 3) ? FALSE : TRUE; if (!$no_errors) echo $error_msg['$_error']; $error_3 ($no_errors && $_error == 3) ? TRUE : FALSE; if ($error_3)    bunch of stuff happens; else    bunch of other stuff;

Anyways, I was then noticing the OR operator on the first line and was thinking that it might be better/safer to user an AND operator. But the more I contemplate, the less I see a difference.

So the real question is, if you want to eliminate two possibilities of a specific variable, are AND and OR identical, or is one logically/functionally more optimal?

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  1. logically the following are identical ( excuse my pseudo code )

    (! expression_one || ! expression_two) /** this is the same as the one below **/ ! (expression_one && expression_two)

    Functionally which one is more optimal? They are both as optimal as each other. Both ways (&& and ||) allow short circuiting if the first expression is true (in the || case) or false ( in the && case)

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