Compare associative array with standard array values PHP

Question

I have a set of ids and names in an associative array and in my other array I have my list of id's that I want to compare against the first list.

I'd like to be able to perform an intersection type search function without losing the names from the associative array.

I've though about doing a nested foreach, but it seems like this process could take forever as both arrays could potentially have 70k+ values.

Please provide a simple example of both arrays.

Matthew Flaschen
– Matthew Flaschen

2009-06-27 02:54:32 +00:00
Commented Jun 27, 2009 at 2:54 — Matthew Flaschen
– Matthew Flaschen, Commented Jun 27, 2009 at 2:54

cletus · Accepted Answer · 2009-06-27 03:01:02Z

6

$assoc = array(
  'a' => 'one',
  'b' => 'two',
);
$array = array('b', 'c', 'd');
$match = array_intersect_key($assoc, array_flip($array));
print_r($match);

outputs:

Array
(
    [b] => two
)

which I believe is what you're after.

edited Jun 27, 2009 at 3:01

answered Jun 27, 2009 at 2:52

cletus

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3 Comments

karim79 Over a year ago

@Cletus - I think you meant to flip the $assoc as opposed to the plain $array.

cletus Over a year ago

No, the above is what I intended. It returns the elements from the assoc whos keys are values in $array, which I believe is what the OP wants. It does so while preserving the values in the assoc. If not, I can correct.

karim79 Over a year ago

@cletus +1 you're right, wasted your time on that one, sorry for that.

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