Changing key of Multidimensional array in PHP

Question

This is my first array

Array
(
   [0] => Array
        (
            [0] => 1
            [1] => Elite
            [2] => Air-Con Bus
            [3] => Monday
        )

    [1] => Array
        (
            [0] => 4
            [1] => KBZ
            [2] => Airplane
            [3] => Wednesday
        )
    [2] => Array
        (
            [0] => 5
            [1] => Yoma
            [2] => Cruise
            [3] => Tuesday
        )
)

I want to be inner array[0] to the outer array key. Like the following array: Can I or not? Please suggest me.

Array(
     [1] => Array
        (
            [0] => 1
            [1] => Elite
            [2] => Air-Con Bus
            [3] => Monday
        )

    [4] => Array
        (
            [0] => 4
            [1] => KBZ
            [2] => Airplane
            [3] => Wednesday
        )

    [5] => Array
        (            
            [0] => 5
            [1] => Yoma
            [2] => Cruise
            [3] => Tuesday
        )
)

Barmar · Accepted Answer · 2013-10-18 03:53:25Z

1

$new_array = array();
foreach ($old_array as $el) {
    $new_array[$el[0]] = $el;
}

answered Oct 18, 2013 at 3:53

Barmar

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2 Comments

Thyu Over a year ago

Yes. I can do like that! Thanks a lot! :)

Barmar Over a year ago

I'm really curious: Why isn't this trivial solution obvious? It pretty much comes from your description of the problem: use element[0] as the keys of a new array.

user557846 · Accepted Answer · 2013-10-18 03:53:39Z

1

one way:

foreach ($array as $a){
$new[$a[0]]=$a;
}

answered Oct 18, 2013 at 3:53

user557846

1 Comment

Thyu Over a year ago

Yes. I can do like that! Thanks a lot! :)

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