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up vote 1 down vote favorite

What is the best way to get the matching keys between two associative arrays:

Array (
    [array_1] => Array (
        [abc] => 111
        [def] => 222
    ),
    [array_2] => Array (
        [ghi] => 995
        [jkl] => 996
        [mno] => 997
    )
)

and

Array (
    [array_1] => Array (
        [123] => 111
        [345] => 222
    ),
    [array_2] => Array (
        [123] => 995
        [432] => 996
        [345] => 997
    ),
    [array_3] => Array (
        [456] => 995
        [345] => 996
        [234] => 997
    )
)

I would like an array to be returned containing only the values: array_1 and array_2.

array_intersect doesn't really work here neither will array_intersect_key as it will return the child array

I want this as a result:

array('array_1','array_2')

since these are the keys that match

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1  
php.net/manual/en/function.array-intersect-key.php –  Mark Baker Jan 30 at 14:55
 
what exactly to you want as result? please update your post with expected result (array) manually –  user1646111 Jan 30 at 15:04
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2 Answers

up vote 2 down vote accepted 
$theListOfKeysWotIWant = array_keys(
    array_intersect_key(
        $array1,
        $array2
    )
);
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up vote 1 down vote

You can try a combination of array_keys() and array_intersect().

For example:

$shared_keys = array_intersect(array_keys($array1),arrays_keys($array2));

The key here (no pun intended) is that array_keys() allows you to manipulate the keys of an array as an array in themselves.

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