php Question posted in
Official manual can be found here.

Php – Merge two arrays, the keys of the first are the values in the second

Merge two arrays, the keys of the first are the values in the second

first array

    Array
    (
        [vegetables] => 2
        [fruits] => 4
    )

second array

    Array
    (
        [0] => Array
            (
                [id] => 68
                [text] => vegetables
            )
    
        [1] => Array
            (
                [id] => 60
                [text] => fruits
            )
    )

I want to get a combined array like this:

    Array
    (
        [0] => Array
            (
                [id] => 68
                [text] => vegetables
                [quantity] => 2
            )
    
        [1] => Array
            (
                [id] => 60
                [text] => fruits
                [quantity] => 4
            )
    )

I understand that this needs to be done in a loop, but how? Confused about keys and values. I’m new to PHP

Tags:

2

Answers


  1. 0

    Let us name these arrays $first and $second respectively.

    The code below must add a ‘quantity’ property to each iteration of the $second array:

    <?php
foreach ($second as $k => $v) {
    if (array_key_exists ($v['text'], $first)) {
        $second[$k]['quantity'] = $first[$v['text']];
    }
    else {
        $second[$k]['quantity'] = 0;
    }
}
?>

    I did not debug the code, but the idea is like that.

    Login or Signup to reply.
  2. 0

    You can do this with the code:

    $first_array = [
    "vegetables" => 2,
    "fruits" => 4,
    "grains" => 1,
];

$second_array = [
    ["id" => 68, "text" => "vegetables"],
    ["id" => 60, "text" => "fruits"],
    ["id" => 72, "text" => "breads"],
];

$combined_array = array_map(function ($item) use ($first_array) {
    $quantity = $first_array[$item['text']] ?? 0; // Use nullish coalescing for default 0
    return array_merge($item, ['quantity' => $quantity]);
}, $second_array);

print_r($combined_array);

    example output:

    Array
(
    [0] => Array
        (
            [id] => 68
            [text] => vegetables
            [quantity] => 2
        )
    [1] => Array
        (
            [id] => 60
            [text] => fruits
            [quantity] => 4
        )
    [2] => Array
        (
            [id] => 72
            [text] => breads
            [quantity] => 0
        )
)
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search