How can I generate a unique array by combining two same array values?

Question

Suppose, I have an array

$array1 = array(10, 20);

and another array of same values as above

$array2 = array(10, 20);

I want to combine these two arrays and generate an array with unique key and value pair. I want $array3 output to be like this:

$array3 = array(10 => 20, 20 => 10)

I tried shuffling the second array ($array2), sometimes it gives me the same values as first one($array1). And my $array3 output is:

$array3 = array(10 => 10, 20 => 20)

@nbin No. Values can be upto 3 or 4 for an array. But two array values are always same. I want to generate an array with unique pair of keys and values. No key and value should be the same. — Sai Kiran Sripada
– Sai Kiran Sripada, Commented May 21, 2014 at 5:26
@Wahyu Kristianto I'm working on a custom application in which a users' file needs to be exchanged with some other user. — Sai Kiran Sripada
– Sai Kiran Sripada, Commented May 21, 2014 at 5:31

Scopey · Accepted Answer · 2014-05-21 05:20:55Z

1

array_combine($array1, array_reverse($array2));

That will achieve the $array3 that you specified in the example you provided, but in general will not work unless $array1 and $array2 have the same number of values.

I'm a little confused about what you really need. Can you provide another example with more keys / values?

answered May 21, 2014 at 5:20

Scopey

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5 Comments

Sai Kiran Sripada Over a year ago

I have two arrays of same values. $array1 = array(10, 20, 30, 40, 50); $array2 = array(10, 20, 30, 40, 50); Two arrays will always have same number of values. I want a new array, which new array key and value should not be the same.

Sai Kiran Sripada Over a year ago

Your algorithm is good. However it fails at $array1 = array(10, 20, 30); $array2 = array(10, 20, 30);

Nabin Kunwar Over a year ago

then pair of keys and values doesnt matter as long as they are not same. yah?

Nabin Kunwar Over a year ago

then above answer does your job.

Scopey Over a year ago

ideone.com/9SHyqN - It does not fail for the example you gave in your comments. Can you provide any more explanation on how it fails?

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