Convert internal array into index of outer array without using foreach in PHP?

Question

I have the following array

Array
(
    [0] => Array
        (
            [id] => 1120
        )

    [1] => Array
        (
            [id] => 1127
        )

    [2] => Array
        (
            [id] => 16101
        )

    [3] => Array
        (
            [id] => 16441
        )

    [4] => Array
        (
            [id] => 18447
        )
)

i want to convert the above array into this form:

Array
    (
        [0]  => 1120

        [1] =>  1127

        [2] => 16101

        [3] => 16441

        [4] => 18447
    )

but condition is this must be done without using foreach. Is this possible?

But why you dont want to use foreach function. What is the problem? foreach function is good for this type of scenarios — Rajender Kumar, Feb 29 '16 at 07:06
@Rajender because in my case there are thousand of entries, and if i use foreach or any other loop then it slow down the server speed. — Amrinder Singh, Feb 29 '16 at 07:08
@Insomania ok, you can use array_column function. For more information http://php.net/manual/en/function.array-column.php — Rajender Kumar, Feb 29 '16 at 07:15

score 4 · Accepted Answer · answered Feb 29 '16 at 07:08

4

Solution for PHP >= 5.5 - array_column function:

// assuming $arr is your initial array
$result = array_column($arr, 'id');

var_dump($result);
// the output:
Array
    (
        [0]  => 1120

        [1] =>  1127

        [2] => 16101

        [3] => 16441

        [4] => 18447
    )

http://php.net/manual/en/function.array-column.php

answered Feb 29 '16 at 07:08

RomanPerekhrest

88,541
4
65
105

hats off!! man, thank you so much, SO always saves my time :) – Amrinder Singh Feb 29 '16 at 07:13

score 0 · Answer 2 · answered Feb 29 '16 at 07:09

0

You can do it using array_column function

$final_array = array_column($your_array, "id");

answered Feb 29 '16 at 07:09

Hardik Solanki

3,153
1
17
28

score 0 · Answer 3 · answered Feb 29 '16 at 07:09

0

You can use array_column to do this.

var_dump(array_column([['id' => 1],['id'=>2]], 'id'));

/*
gives you..

array(2) {
  [0]=>
  int(1)
  [1]=>
  int(2)
}
*/

answered Feb 29 '16 at 07:09

Sherif

11,786
3
32
57

score 0 · Answer 4 · answered Feb 29 '16 at 07:10

0

array_combine(array_keys($arr), array_map(function($item) { return $item['id']; }, $arr));

answered Feb 29 '16 at 07:10

Alin Purcaru

43,655
12
77
90

2

using bazooka to kill mosquito :) – bansi Feb 29 '16 at 07:17

score 0 · Answer 5 · edited May 23 '17 at 11:45

0

For PHP versions >=4.0.6 you can simply use array_map like as

$arr = array(array('id' => 1),array('id' => 2),array('id' => 3));
function call_function($v){ 
    return $v['id'];
}
$result = array_map('call_function',$arr);
print_r($result);

Instead you can simply use reset function as @Ghost said like as

$arr = array(array('id' => 1),array('id' => 2),array('id' => 3));
$result = array_map('reset',$arr);
print_r($result);

Output

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

Demo

edited May 23 '17 at 11:45

Community

1
1

answered Feb 29 '16 at 07:18

Narendrasingh Sisodia

21,247
6
47
54

1

or just simply `$result = array_map('reset', $arr)` – Kevin Feb 29 '16 at 07:38
Yes you're right @Ghost I've updated my answer – Narendrasingh Sisodia Feb 29 '16 at 09:07
Downvoters post the reason for downvoting. So I can improve my answer – Narendrasingh Sisodia Mar 02 '16 at 05:13
1

i got the notification, actually that was my upvote, its funny yours has the only downvote here, you got a fan following you lol :D – Kevin Mar 02 '16 at 05:17

score 0 · Answer 6 · answered Feb 29 '16 at 07:19

$arrFirstArray = array(
    '0' => array(
        'id' => 1120
    ),
    '1' => array(
        'id' => 1127
    ),
    '2' => array(
        'id' => 16101
    ),
    '3' => array(
        'id' => 16441
    ),
    '4' => array(
        'id' => 18447
        ));

echo $intFirstArray = count($arrFirstArray);

$arrSecondArray = array();
for ($intI = 0; $intI < $intFirstArray; $intI++)
{
    global $arrSecondArray;
    $arrSecondArray[] = $arrFirstArray[$intI]['id'];
}
echo '<pre>';
print_r($arrSecondArray);

This will definitely work.

Convert internal array into index of outer array without using foreach in PHP?

6 Answers6