I’m not trying to be awkward or obnoxious here, but no, they don’t. If they did, why would two different operators exist? OR and AND don’t mean the same thing.

if [id] doesn’t equal 1 OR if [id] doesn’t equal 5

Right, think about that. If it doesn’t equal 1 or it doesn’t equal 5. 1 doesn’t equal 5, so it meets one of the two OR conditions. Since the entire definition of OR is that it only needs to meet one of them, an ad will display.

OR would only work here if you were trying to use positive conditions — i.e. “if ID does equal 1 or it does equal 5, then don’t show an ad”. (Conversely, if you were doing it that way, you could not use AND. They’re not interchangeable.)

As other people have pointed out, there are probably better ways of doing this, but all I’m trying to show is that if users see this post and use the code Keith provided, it won’t work.

It is a little late for me to be testing it out myself (I should be heading to bed sometime soon). Both logically make sense, though.

if [id] doesn’t equal 1 OR if [id] doesn’t equal 5

If ID equals 2, it will be true. If it is 1, it still will return as false because of the OR statement.

The exact same thing will go for if it is an AND statement. I am not sure why it isn’t working how it is suppose to on your install. I could be wrong, of course, but it doesn’t make sense to me why this isn’t working correctly. Maybe it’s just me….

Anyone else have any insight on this? Maybe a third opinion will help clear it up.

-JD

My question is, is it more efficient to use isset() with an array key than to use in_array()?

If I change it to

if(get_the_ID() != 1 && get_the_ID() != 5)


if(get_the_ID() != 1 || get_the_ID() != 5) {
echo '
<div> [Your Advertisement Code] </div>
‘;
}


(1 and 5 are actual existing post IDs.)

And as I expected, “[Your Ad Code]” appeared on all posts, including 1 and 5.

If I change it to

if(get_the_ID() != 1 || get_the_ID() != 5)

then, as I expected, “[Your Ad]” does not appear on either post 1 or post 5, but does appear on all other posts.

Maybe I didn’t explain it very well, but seriously, try it out for yourself. The OR condition works exactly as I (perhaps incoherently) described. It’s not a matter of preference, it just will not work here. The only post that would NOT show ads if you used this code with the OR operator is a post that matches both ID numbers, and of course there is no such post, so they will all show ads.

Both logically work. I think most people here seem to refer using OR, but whatever. It really is all the same when it runs.

Say there are 2 posts that you do not want ads on — IDs 23 and 77. If you use your code:

if(get_the_ID() != 23 || get_the_ID() != 77)

You’re saying “If this post is not #23 or is it not #77, show an ad” — which means that on both 23 and 77, it will show an ad. There are 2 possible conditions under which you want no ad displayed: The state of not being 23, and the state of not being 77. The OR code requires that a post meet only one of those conditions — 23 gets an ad because it meets the condition of not being 77, and 77 gets an ad because it meets the condition of not being 23.

So if you do want to do it this way, you need the AND condition:

if(get_the_ID() != xx && get_the_ID() != xx)

That way you’re saying “If this post is not 23 and it is not 77, show an ad” — you’re requiring that it meet both conditions: The state of not being 23 and the state of not being 77.