Add array values with key to multidimensional array without adding a new 'layer'

Question

I have found several similar topics but none answers exactly what I need. I want to add data to a specific key index of a multidiensional array - without adding a new array layer or deleting other array layers.

I have tried to solve it with array_merge and the normal add to array method.

This is my array:

$array = [
    'capital' => [
        'Germany' => 'Berlin',
        'Austria' => 'Vienna',
        'France' => 'Paris',
    ],
    'currency' => [
        'Germany' => 'Euro',
        'Austria' => 'Euro',
        'France' => 'Euro',
    ],
 ];

If I try

$newData2 = [
    'Italy' => 'Rome',
    'China' => 'Beijing',
];
$array['capital'][] = $newData2;

I get

$array = [
    'capital' => [
        'Germany' => 'Berlin',
        'Austria' => 'Vienna',
        'France' => 'Paris',
        [
            'Italy' => 'Rome',
            'China' => 'Beijing',
        ],
    ],
    'currency' => [
        'Germany' => 'Euro',
        'Austria' => 'Euro',
        'France' => 'Euro',
    ],
 ];

That's incorrect, the 2 new should be on the same array layer as the others.

If I use array_merge, the currency section of the array is deleted:

 array_merge($array['capital'], $newData2);

My array should look like this:

$array = [
    'capital' => [
        'Germany' => 'Berlin',
        'Austria' => 'Vienna',
        'France' => 'Paris',
        'Italy' => 'Rome',
        'China' => 'Beijing',
    ],
    'currency' => [
        'Germany' => 'Euro',
        'Austria' => 'Euro',
        'France' => 'Euro',
    ],
 ];

AterLux · Accepted Answer · 2019-08-06 08:44:21Z

1

 $array['capital'] = array_merge($array['capital'], $newData2);

 print_r($array);

answered Aug 6, 2019 at 8:44

AterLux

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Comments

Rakesh Jakhar · Accepted Answer · 2019-08-06 08:44:59Z

1

You can try this

 $array['capital']['Italy'] = 'Rome';
 $array['capital']['China'] = 'Beijing';

answered Aug 6, 2019 at 8:44

Rakesh Jakhar

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Comments

Armin · Accepted Answer · 2019-08-06 08:52:13Z

1

You can try just adding second array to the capital key:

$array["capital"] += $newData2;

I should add that there is a difference between merge and + operator, and you should use the one that fits better your needs.

edited Aug 6, 2019 at 8:52

answered Aug 6, 2019 at 8:46

Armin

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