PHP | Add additional keys and values to an associative array by function [duplicate]

Question

I would like to add additional keys and values to an associative array by function. I try to simplify my desire to this very simple example.

For example, I have the following array:

$array = array (
    'key1' => array(
        'attribute1' => 'value1',
        'attribute2' => 'value2',
        'attribute3' => 'value3',
    ),
    'key2' => array(
        'attribute1' => 'value1',
        'attribute2' => 'value2',
        'attribute3' => 'value3',
    )
);

While creating the array, some elements should come from a function:

$array = array (
    'key1' => array(
        'attribute1' => 'value1',
        'attribute2' => 'value2',
        'attribute3' => 'value3',
    ),
    getArrayElements(),
    'key2' => array(
        'attribute1' => 'value1',
        'attribute2' => 'value2',
        'attribute3' => 'value3',
    )
);

function getArrayElements()
{
    $new_array = array (
        'additional_key_1'  => array(
            'attribute1' => 'value1',
            'attribute2' => 'value2',
            'attribute3' => 'value3',
        ),
        'additional_key_2'  => array(
            'attribute1' => 'value1',
            'attribute2' => 'value2',
            'attribute3' => 'value3',
        ),
    );
    return $new_array;
}

I get the following result:

Array
(
    [key1] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
    [0] => Array
        (
            [additional_key_1] => Array
                (
                    [attribute1] => value1
                    [attribute2] => value2
                    [attribute3] => value3
                )

            [additional_key_2] => Array
                (
                    [attribute1] => value1
                    [attribute2] => value2
                    [attribute3] => value3
                )

        )
    [key2] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
)

I would like to have this result

Array
(
    [key1] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
    [additional_key_1] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
    [additional_key_2] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
    [key2] => Array
        (
            [attribute1] => value1
            [attribute2] => value2
            [attribute3] => value3
        )
)

Is this possible? How can I achieve this?

Thank you very much! Is there a downside to it? In the following post nobody accepted it as answer: stackoverflow.com/questions/35548170/… — Phantom
– Phantom, Commented Feb 2, 2023 at 2:30
You can show your appreciation on the provided page. (You shouldn't write "thank you"s as comments.) Don't trust the answer scores. I often answer old questions, so my answers take a while before they bubble up to the top. You can help it get there. @Phantom — mickmackusa
– mickmackusa ♦, Commented Feb 2, 2023 at 2:31
Prior to PHP7.4, the technique fails with Parse error: syntax error, unexpected '...' (T_ELLIPSIS), expecting ']' This is no longer concern because everyone should be programming on more modern, supported versions of PHP. @Phantom — mickmackusa
– mickmackusa ♦, Commented Feb 2, 2023 at 2:41
Is there also a solution for PHP7.3? Thanks for the clarification @mickmackusa — Phantom
– Phantom, Commented Feb 2, 2023 at 2:54

Barmar · Accepted Answer · 2023-02-02 01:41:06Z

-1

Use array_merge().

$array = array_merge(
    array (
        'key1' => array(
            'attribute1' => 'value1',
            'attribute2' => 'value2',
            'attribute3' => 'value3',
        ),
        'key2' => array(
            'attribute1' => 'value1',
            'attribute2' => 'value2',
            'attribute3' => 'value3',
        )
    ), 
    get_array_elements()
);

answered Feb 2, 2023 at 1:41

Barmar

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