Using array_intersect on a multi-dimensional array - php

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. :(

Answer 1

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
)
)

Answer 2

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.

Answer 3

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)