PHP array_diff_ukey() function

Last Updated: February 11, 2022

array_diff_ukey(): Compare the keys of two arrays (using a user-defined key comparison function), and return the differences.

Syntax

array_diff_ukey(array $array, array ...$arrays, callable $key_compare_func): array

Parameters

Parameter Description
array Required. The array to compare from
arrays Required. arrays to compare against
key_compare_func Required. Key comaparison function will return integer less than, equal to, or greater than zero . First argument is compared agaist the second argument

Return Value

Returns an array containing all the entries from array that are not present in any of the other arrays.

Example

function myfunction($a,$b)
{
if ($a===$b)
  {
  return 0;
  }
  return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("d"=>"red","b"=>"green","e"=>"blue");

$result=array_diff_ukey($a1,$a2,"myfunction");
print_r($result);

?>

Output

Array ( [a] => red [c] => blue )
Test