Using array_intersect on a multi-dimensional array

Question

I have two arrays that both look like this:

Array
(
    [0] => Array
        (
            [name] => STRING
            [value] => STRING
        )

    [1] => Array
        (
            [name] => STRING
            [value] => STRING
        )

    [2] => Array
        (
            [name] => STRING
            [value] => STRING
        )
)

and I would like to be able to replicate array_intersect by comparing the ID of the sub arrays within the two master arrays. So far, I haven't been successful in my attempts. :(

Doing a custom comparison, you'll need to use array_uintersect() php.net/array_uintersect, which uses a user-defined comparison function. — Wiseguy
– Wiseguy, Commented Apr 13, 2011 at 17:47
Despite all of the upvotes on this old post, your question does not contain a good, clear minimal reproducible example. — mickmackusa
– mickmackusa ♦, Commented Jan 24, 2022 at 22:38

Wiseguy · Accepted Answer · 2011-04-13 17:59:17Z

59

Use array_uintersect() to use a custom comparison function, like this:

$arr1 = array(
           array('name' => 'asdfjkl;', 'value' => 'foo'),
           array('name' => 'qwerty', 'value' => 'bar'),
           array('name' => 'uiop', 'value' => 'baz'),
        );

$arr2 = array(
           array('name' => 'zxcv', 'value' => 'stuff'),
           array('name' => 'asdfjkl;', 'value' => 'foo'),
           array('name' => '12345', 'value' => 'junk'),
           array('name' => 'uiop', 'value' => 'baz'),
        );

$intersect = array_uintersect($arr1, $arr2, 'compareDeepValue');
print_r($intersect);

function compareDeepValue($val1, $val2)
{
   return strcmp($val1['value'], $val2['value']);
}

which yields, as you would hope:

Array
(
    [0] => Array
        (
            [name] => asdfjkl;
            [value] => foo
        )

    [2] => Array
        (
            [name] => uiop
            [value] => baz
        )

)

answered Apr 13, 2011 at 17:59

Wiseguy

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3 Comments

bafromca Over a year ago

How could you modify this to make sure all columns match, not just 'value'?

ChrisS Over a year ago

@bafromca I think return strcmp(serialize($val1), serialize($val2)); might work

rubo77 Over a year ago

better use a recursive funktion like:

function compare_arrays($a, $b) {     if (is_array($a) && is_array($b)) {         $diff = array_udiff($a, $b, 'compare_arrays');         return empty($diff) ? 0 : 1;     }     return ($a < $b) ? -1 : 1; }  $result = array_uintersect($a, $b, 'compare_arrays');

rüff0 · Accepted Answer · 2019-05-08 06:21:47Z

5

you can use embedded function with array_uintersect php function. ex:

$intersectNames = array_uintersect($arr1, $arr2, function ($val1, $val2){
    return strcmp($val1['name'], $val2['name']);
    });

$intersectValues = array_uintersect($arr1, $arr2, function ($val1, $val2){
    return strcmp($val1['value'], $val2['value']);
    });

print_r('namesIntersected' => $intersectNames, 'valuesIntersected' => $intersectValues)

answered May 8, 2019 at 6:21

rüff0

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Comments

smottt · Accepted Answer · 2015-12-21 14:07:57Z

4

function compareDeepValue($val1, $val2)
{
   return strcmp($val1['value'], $val2['value']);
}

Be sure that val2 key is existing in val1 array, because the function is ordering array first. Very strange.

edited Dec 21, 2015 at 14:07

smottt

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answered Dec 21, 2015 at 13:50

ScreamZ

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