Add a new index to multidimensional array

Question

I have a multidimensional array.

ie.

Array
(
    [0] => Array
        (
            [item_id] => 1
            [item_name] => x

        )


    [1] => Array
        (
            [item_id] => 1
            [item_name] => y

        )

)

I need a way to add a new index to that array .

Array
(
    [0] => Array
        (
            [item_id] => 1
            [item_name] => x
            [value] => 1

        )


    [1] => Array
        (
            [item_id] => 1
            [item_name] => y
            [value] => 1
        )

)

The value may/may not remain the same throughout.

One way to implement this is to loop the array and insert the new index value.

My question is that is there any other better way to do it.

Thanks.

array_walk should be sufficient, since this is only a 2D array. — Passerby
– Passerby, Commented Mar 28, 2013 at 8:13
There are many ways to possibly do this, but a loop is the most straight forward thing you can possibly do. — deceze
– deceze ♦, Commented Mar 28, 2013 at 9:09

Community · Accepted Answer · 2023-11-17 20:24:57Z

7

You don't need to use array_walk_recursive, you can use array_walk:

array_walk($array, function(&$a) {
  $a['value'] = 1;
});

edited Nov 17, 2023 at 20:24

CommunityBot

11 silver badge

answered Mar 28, 2013 at 8:51

billyonecan

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1 Comment

billyonecan Over a year ago

It sounds like you're using an older version of PHP, I should really have mentioned that anonymous functions, such as the above, will only work with PHP 5.3 >

웃웃웃웃웃 · Accepted Answer · 2020-05-20 10:57:50Z

1

Suppose $arr is your array and $yourval is the value to be stored as the new array element. You can do it as follows.

for($i=0;$i<count($arr);$i++){
     $arr[$i]['value'] = $yourval;
}
echo '<pre>';
print_r($arr);//Will display the new array

edited May 20, 2020 at 10:57

answered Mar 28, 2013 at 8:31

웃웃웃웃웃

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1 Comment

웃웃웃웃웃 Over a year ago

You are welcome @user1584103 Plz mark it as correct answer if you got the output..

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