PHP array_combine is not returning all the values

Question

I am reading from the excel file two columns. One contains old ids and the other one returns new ids. So I am having two arrays:

$newAttributeIDs and $oldAttributeIDs

If I do count of each array separatly, I will get this result:

var_dump(count($newAttributeIDs)); // result is 3440
var_dump(count($oldAttributeIDs)); // result is 3440

And I would like to have key value pair of this values, but when I do:

$keyValueNewOldAttributeIDs = array_combine($oldAttributeIDs, $newAttributeIDs);

And then:

var_dump(count($keyValueNewOldAttributeIDs)); // result is 1990

I am getting wrong result, and some ids are now missing in the $keyValueNewOldAttributeIDs array. Does anyone knows what is causing this? Thanks!

No, I just checked, I did var_dump(count(array_unique($oldAttributeIDs))); and it returned 1990. — user2450639
– user2450639, Commented Jun 24, 2019 at 12:34
There you go then. You can't have an array with duplicate keys. — Jonnix
– Jonnix, Commented Jun 24, 2019 at 12:34
array_merge will not return key, value pair of the two arrays. — user2450639
– user2450639, Commented Jun 24, 2019 at 12:35
@user2450639 Show the arrays you have(just a sample) and your expected output. Then we can tell you what went wrong. — mighty_dev
– mighty_dev, Commented Jun 24, 2019 at 12:49

user2450639 · Accepted Answer · 2019-06-24 12:50:05Z

1

I solve this flipping the values. Since I had some of the same values in the $oldAttributeIDs, result was unexpected. First value should have all unique values in the array. I missed that fact.

answered Jun 24, 2019 at 12:50

user2450639

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