How to push an array in a multidimensional array into a specific subarray in another multidimensional array

Question

I have two arrays:

$array1 = array(299945 => [13654 => [9917 => [0 => '0', 9 => '9', 33 => '33']]]);
$array2 = array(13654 => [9940 => [0 => '0']]);

Each of these are created from different DBQueries which create these results.

I know want to take the '9940' key from $array2 and push it into $array1 so that it will be another element in the 13654 array. Thus the final result would be:

$array1 = array(299945 =>[13654 => [9917 => [0 => '0', 9 => '9', 33 => '33'], 9940 => [0 => '0']]])

How can I do this?

Is the key you are looking for in first array always located on second level (depth)? Or do you want to search for the key 9940 recursively in the array? So the key may also be located in other sub arrays much deeper in your first array. — Armin
– Armin, Commented Jan 18, 2018 at 8:56

e_i_pi · Accepted Answer · 2018-01-18 09:18:09Z

1

There's a few ways of doing this, here's one that uses array_replace_recursive():

<?php

header('Content-type: text/plain');

$array1 = array(299945 => [13654 => [9917 => [0 => '0', 9 => '9', 33 => '33']]]);
$array2 = array(13654 => [9940 => [0 => '0']]);

$array3 = array_replace_recursive($array1, [key($array1) => $array2]);

print_r($array3);

Output:

Array
(
    [299945] => Array
        (
            [13654] => Array
                (
                    [9917] => Array
                        (
                            [0] => 0
                            [9] => 9
                            [33] => 33
                        )

                    [9940] => Array
                        (
                            [0] => 0
                        )

                )

        )

)

edited Jan 18, 2018 at 9:18

answered Jan 18, 2018 at 8:51

e_i_pi

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8 Comments

splash58 Over a year ago

Although this solution correctly uses array_merge_recursive, it will not work if you change keys, even with exactly such an array structure

ABD Over a year ago

@splash58 change which keys?

e_i_pi Over a year ago

The initial key 299945. Without the OP stipulating the schema of the given arrays, this is the best answer I can give.

splash58 Over a year ago

@e_i_pi Are you shure? :) Use [key($array1) => $array2], at least

splash58 Over a year ago

I think that we will see new question for that in some time, or OP will ask you again here, because structure of array1 as [12=>[13=>], [14=>]] seems to be very possible

|

Pevara · Accepted Answer · 2018-01-18 08:51:52Z

0

If you just want a union of two arrays, there is not much to it:

$array1 += $array2

You should probably think about more complex situation with duplicate keys and issues like that, so I usually find array_merge to be the better tool for adding two arrays together.

answered Jan 18, 2018 at 8:51

Pevara

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