CODEWITHSUNDEEP
phparrays
Pratik Bothra
Pratik Bothra

Reputation: 2694

Computing difference by comparing nested arrays

I was under the impression that array_diff evaluates the difference between the values in the two arrays. But somehow it doesn't work...I am guessing nested arrays is the problem here. Clearly array_diff_assoc is not the solution as keys are irrelevant in this case.

I don't even want to make it go nested, just see whether the value (in this case, array) inside are identical or not.

$file_details = array(
    array(
            "uuid" => "45ebdbaa-380b-483b-80a2-73d7c53088e2",
            "filename" => "train_failure.mp3",
        ),
    array("uuid" => "97baa061-4208-4aeb-8136-eb76c0932a3d",
        "filename" => "train_work1.mp3"
    ),
    array("uuid" => "ksjdfls6-eb76c0932a3d",
        "filename" => "train.mp3"
    ),
);

$items = array(
    array(
            "uuid" => "45ebdbaa-380b-483b-80a2-73d7c53088e2",
            "filename" => "train_failure.mp3",
        ),
     array(
            "uuid" => "1233489eb76c0932a3d",
            "filename" => "train.mp3"
        ),
);

print_r(array_diff($file_details,$items));

This returns an empty array...How should I go about fixing this?

My desired output is 

array(
        "uuid" => "97baa061-4208-4aeb-8136-eb76c0932a3d",
        "filename" => "train_work1.mp3"
     ),
array(
        "uuid" => "ksjdfls6-eb76c0932a3d",
        "filename" => "train.mp3"
    ),

UPDATE -: *I know array_diff doesn't work for 1-d array, I'm just surprised there is no direct php function for doing a comparison on multidimensional arrays.*

Upvotes: 1

Views: 139

Answers (3)

MarcoS
MarcoS

Reputation: 17721

From the array_diff() man page:

Note:

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using

array_diff($array1[0], $array2[0]);

Upvotes: 0

ritesh
ritesh

Reputation: 2265

array_diff() method is supposed to work with 1-d array.

Upvotes: 1

Alma Do
Alma Do

Reputation: 37365

Your array items are arrays and cannot be compared as strings (array_diff() will treat all values as strings - for example, it will try to stringify objects via calling their __toString() method).

You can use array_udiff() instead:

$rgResult=array_udiff($file_details, $items, function($rgX, $rgY)
{
   return $rgX['uuid']<$rgY['uuid']?-1:$rgX['uuid']!=$rgY['uuid'];
});

Upvotes: 2

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