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array_intersect_ukey()

« array_intersect_uassoc | array_key_exists »
<?php
// custom callback function
function compare_func($a, $b) {
    if ($a === $b) return 0;
    if ($a > $b)   return 1;
    return -1;
};

$array = array_intersect_ukey (
    , // array $array1
    , // array $array2
     ✓?  // callable $key_compare_func
);
?>
Result
$array = [
  'blue' => 1,
  'green' => 3,
]
Examples
#1 array_intersect_ukey  (["blue" => 1, "red" => 2, "green" => 3, "purple" => 4],
 ["green" => 5, "blue" => 6, "yellow" => 7, "cyan" => 8],
 "compare_func")
See also
array_diff, array_diff_assoc, array_diff_key, array_diff_uassoc, array_diff_ukey, array_intersect, array_intersect_assoc, array_intersect_key, array_intersect_uassoc, array_udiff, array_udiff_assoc, array_udiff_uassoc, call_user_func
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