Get list of values inside a multi-dimensional php array

Question

I need to change this array:

$array = [
        [0] => [
            'id' => '100'
        ],
        [1] => [
            'id' => '200'
        ],
        [2] => [
            'id' => '300'
        ]
    ];

Into this: $array2 = [100, 200, 300];

A long time ago I found a built-in PHP function which could do this for me. But i can't for the life of me remember which one it was. Of course I could do it manually, but it would be easier and more readable if I could use a builtin PHP function

$result=array(); foreach ($array as $el){ array_push($result, $el["id"]}; — cpugourou, Mar 14 '16 at 11:58

score 1 · Answer 1 · edited Mar 14 '16 at 12:36

1

Use array_column like this: array_column($array, 'id');

edited Mar 14 '16 at 12:36

Caleb

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answered Mar 14 '16 at 11:56

Benjamin Tamasi

662
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this is the simplest, but note you must be running PHP 5 >= 5.5.0 or PHP 7 – Caleb Mar 14 '16 at 12:14

aslawin · Answer 2 · 2016-03-14T12:10:00.713

1st solution:

Use array_map() function with inline function:

$array2 = array_map(function($arrayElement){return $arrayElement['id'];}, $array);

2nd solution:

Use foreach loop:

function getValues($array, $index)
{
    $result = array();
    foreach($array as $element)
    {
        if(isset($element[$index])) //check if index exists
            $result[] = $element[$index];
    }

    return $result;
}

$array2 = getValues($array, 'id');

This function has two parameters: array from which you gets values and index, for example 'id'.

Result of two methods is the same:

Array
(
    [0] => 100
    [1] => 200
    [2] => 300
)

Get list of values inside a multi-dimensional php array

2 Answers2