Array intersect on key in array?

Question

I have an array that has countries:

array(
\'AF\'=>\'AFGHANISTAN\',
\'AL\'=>\'ALBANIA\',
\'DZ\'=>\'ALGERIA\',
\'AS\'=>\'AMERICAN SAMOA\',
);
         


        

Answer 1

Simply loop over the SECOND array, and fetch the values from the first. Vise versa seems unneeded inefficient indeed.

So:

$Arr1 = array(
'AF'=>'AFGHANISTAN',
'AL'=>'ALBANIA',
'DZ'=>'ALGERIA',
'AS'=>'AMERICAN SAMOA',
);

$Arr2 = array('AL', 'DZ');

$result = array();
foreach ($Arr2 as $cc){
  if (isset($Arr1[$cc])){
    $result[$cc] = $Arr1[$cc];
  }
}
print_r($result);

I don't think that is inefficient.

Edit addition: If you are 100% sure the $Arr2 contains only codes that can be found in $Arr1, you can of course skip the isset() test.