Inline array concatenation?

Question

Is it possible to concatenate an array using inline code (i.e. inside the array declaration)? For instance:

function get_array() {
    return array('four' => 4, 'five' => 5);
}

$arr = array(
    'one' => 1,
    'two' => 2,
    'three' => 3,
    get_array()
);

var_dump($arr);

will result in:

Array(
    [one] => 1
    [two] => 2
    [three] => 3
    [0] => Array(
        [four] => 4
        [five] => 5
    )
)

Whereas the desired result would be:

Array(
    [one] => 1
    [two] => 2
    [three] => 3
    [four] => 4
    [five] => 5
)

John Conde · Accepted Answer · 2014-03-10 19:22:48Z

6

Use array_merge(). It is an extra step but since you can't do this during the array declaration it is the next best thing.

$new_array = array_merge($arr, array('four' => 4, 'five' => 5));

print_r($new_array);
Array ( [one] => 1 [two] => 2 [three] => 3 [four] => 4 [five] => 5 )

See it in action

answered Mar 10, 2014 at 19:22

John Conde

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5 Comments

Yoav Kadosh Over a year ago

Thanks, but is it possible to do so within the initial array declaration?

gen_Eric Over a year ago

@YoavKadosh: No it is not. You could also try the "array union" (+) operator: $array = array('one' => 1, 'two' => 2) + array('three' => 3);

Yoav Kadosh Over a year ago

Ok, that's what I wanted to know.

Yoav Kadosh Over a year ago

@RocketHazmat that's exactly what I was looking for. If you want, you can post that as an answer and i'll accept it (sorry John... :) ).

gen_Eric Over a year ago

@YoavKadosh: That's the same thing as array_merge except it has a different behavior when it comes to duplicate keys.

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