Question

How to use array_intersect_ukey() function to get intersection of arrays using a callback function on the keys in PHP

Answer 1

function key_compare_function($key1, $key2)
{
    if ($key1 == $key2)
        return 0;
    else if ($key1 > $key2)
        return 1;
    else
        return -1;
}

$arr1 = array("a" => "aaa", "b" => "bbb", "c" => "ccc");
$arr2 = array("a" => "AAA", "B" => "bbb", "c" => "xyz", "www");

var_dump(array_intersect_ukey($arr1, $arr2, 'key_compare_function'));

 
/*
run: 

array(2) { ["a"]=> string(3) "aaa" ["c"]=> string(3) "ccc" } 

*/

 

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