PHP equal variables

Question

I wondered if there is any way to check if any of a large amount of variables are equal. If I only have a few variables I can just do this:

if ($a == $b || $a == $c || $b == $c)

However, if I have 20 variables it will take some time to write all combinations. Is there another method?

John Conde · Accepted Answer · 2014-01-16 02:45:27Z

13

if (count(array_unique(array($a, $b, $c), SORT_REGULAR)) === 1) {
    // all equal
}

All this code does is place the variables in an array and eliminates duplicates. If they are all equal the result of array_unique() should be an array with one value.

If you want to make sure all of them are different it's not much different. Just check to see if the filtered array is the same size as the original array:

$array = array($a, $b, $c);
if (count(array_unique($array, SORT_REGULAR)) === count($array)) {
    // all not equal 
}

edited Jan 16, 2014 at 2:45

answered Jan 15, 2014 at 18:48

John Conde

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6 Comments

user142162 Over a year ago

Probably a good idea to use the SORT_REGULAR flag with array_unique.

John Conde Over a year ago

I think that's a good idea, too. Added it to my answer. Thank you for the feedback.

The Programmer Over a year ago

Sorry for bad explanation, but what I need is to check if no variables are equal, not if all are equal. Do you have any idea how to do that?

user557846 Over a year ago

awesome answer ruined by poorly asked questions.

Funk Forty Niner Over a year ago

Now where's that +10 upvote on comments button when you need one? @Dagon --- +1 ;-)

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