get key from two multidimensional array whose values are equal

Question

$a: Array
(
[161] => Array
    (
        [idAgent] => 30
        [idClient] => 97
    )

[163] => Array
    (
        [idAgent] => 30
        [idClient] => 107
    )

[712] => Array
    (
        [idAgent] => 12
        [idClient] => 349
    )

[718] => Array
    (
        [idAgent] => 12
        [idClient] => 57
    )

[721] => Array
    (
        [idAgent] => 9
        [idClient] => 236
    )

[729] => Array
    (
        [idAgent] => 12
        [idClient] => 118
    )

[739] => Array
    (
        [idAgent] => 20
        [idClient] => 483
    )
...
)

$b: Array
(
[160] => Array
    (
        [idAgent] => 31
        [idClient] => 926
    )

[162] => Array
    (
        [idAgent] => 30
        [idClient] => 97
    )
 ...
 )

I have two multidimensional arrays and I need to get the key whose array value belongs both $a and $b. In this case the result must be the array with 162 key.

$result: Array
(    
  [162] => Array
    (
        [idAgent] => 30
        [idClient] => 97
    )
...
)

I've tried, but without any luck, something like this:

array_intersect_uassoc( $a, $b, function ($A, $B){
    return ($A['idAgent'] - $B['idAgent']);
});

Or, it's better to create one multi array and then extract duplicates?

Possible duplicate of [How to search by key=>value in a multidimensional array in PHP](http://stackoverflow.com/questions/1019076/how-to-search-by-key-value-in-a-multidimensional-array-in-php) — miken32, Mar 01 '17 at 18:19

Petr Hejda · Accepted Answer · 2017-03-01T20:38:14.840

1

You can use just array_uintersect (compares intersection of arrays by callback function).

The strcmp function in my example is just for easier comparison of strings.

If you need to search for unique combination of idAgent and idClient, put them as a string together for comparison.

$result = array_uintersect( $a, $b, function($A, $B){
    return strcmp($A['idAgent'] . '_' . $A['idClient'], $B['idAgent'] . '_' . $B['idClient']);
});

edited Mar 01 '17 at 20:38

answered Mar 01 '17 at 18:22

Petr Hejda

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@CasimiretHippolyte that wouldn't be equal values (to the `idAgent` and `idClient` properties) as the OP has asked, so the function wouldn't see them as intersection. – Petr Hejda Mar 01 '17 at 20:08
@CasimiretHippolyte Oh I see. Updated my answer accordingly. – Petr Hejda Mar 01 '17 at 20:38
Correct, but I can't mark this as correct answer, because I do not have necessary reputation points. tx. – vmar Mar 02 '17 at 08:39

get key from two multidimensional array whose values are equal

1 Answers1