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. :(

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.