How to change array key of this array? [duplicate]

Question

Possible Duplicate:
In PHP, how do you change the key of an array element?

This the array

Array
(
    [0] => Array
        (
            [id] => 1
            [due_date] => 2011-09-23
            [due_amount] => 10600.00
        )

    [1] => Array
        (
            [id] => 2
            [due_date] => 2011-10-23
            [due_amount] => 10600.00
        )

    [2] => Array
        (
            [id] => 3
            [due_date] => 2011-11-23
            [due_amount] => 10600.00
        )
)

how to change id to u_id in this array?

Regards

What have you tried so far so it saves our time trying what you have already tried? — RSM
– RSM, Commented Aug 24, 2011 at 19:37

Evan Mulawski · Accepted Answer · 2011-08-24 19:53:16Z

6

array_walk_recursive($array, 'changeIDkey');

function changeIDkey($item, &$key)
{
    if ($key == 'id') $key = 'u_id';
}

PHP Manual: array_walk_recursive

EDIT

This will not work for the reason @salathe gave in the Comments below. Working on alternative.

ACTUAL ANSWER

function changeIDkey(&$value,$key)
{
    if ($value === "id") $value = "u_id";
}

$new = array();
foreach ($array as $key => $value)
{
    $keys = array_keys($value);
    array_walk($keys,"changeIDkey");
    $new[] = array_combine($keys,array_values($value));
}

var_dump($new); //verify

Where $array is your input array. Note that this will only work with your current array structure (two-dimensions, changes keys on only second dimension).

The loop iterates through the inner arrays changing "id" to "u_id" in the keys and then recombines the new keys with the old values.

edited Aug 24, 2011 at 19:53

answered Aug 24, 2011 at 19:28

Evan Mulawski

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3 Comments

salathe Over a year ago

Take heed of the note on the array_walk() manual page, which is just as applicable for array_walk_recursive(): Only the values of the array may potentially be changed; its structure cannot be altered, i.e., the programmer cannot add, unset or reorder elements. If the callback does not respect this requirement, the behavior of this function is undefined, and unpredictable.

Evan Mulawski Over a year ago

@salathe: Yes, just noticed that. Working on alternative.

Ja͢ck Over a year ago

This is just awful, what's wrong with a simple array_walk() and the loop body of @nobody's answer as the callback?

nobody · Accepted Answer · 2011-08-24 19:29:46Z

4

foreach( $array as &$element ) {
    $element['u_id'] = $element['id'];
    unset( $element['id'] );
}

answered Aug 24, 2011 at 19:29

nobody

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