php two layer array key search

Question

$arr = array (

    0 => array(
        'id' => 1,
        'name' => 'john'
    ),
    1 => array(
        'id' => 4,
        'name' => 'elisabeth'
    )
);

Let's say all we know is the 'id' of the inner array, what would be the best way to search for $arr element, that contains an array, that contains our id?

Populus · Accepted Answer · 2013-03-19T19:03:59.783

1

function search($id)
{
    foreach ($arr as $item) {
        if (isset($item['id']) && $item['id'] == $id) {
            return $item; // or whatever you want to return
        }
    }
}

UPDATE:

function search($id)
{
    foreach ($arr as $key => $item) {
        if (isset($item['id']) && $item['id'] == $id) {
            return $key; // Return key...
        }
    }
}

edited Mar 19 '13 at 19:03

answered Mar 19 '13 at 16:05

Populus

7,470
3
38
54

and `return false;` if not found – Waygood Mar 19 '13 at 16:06
yea, but i need the key, of that element, for instance id=4 returns 1 and id=1 returns 0 – Ben Mar 19 '13 at 18:20
i'm new to php, so i'm afraid of "doing it wrong" – Ben Mar 19 '13 at 18:22
added updated code to return key – Populus Mar 19 '13 at 19:04

score 0 · Answer 2 · answered Mar 19 '13 at 16:05

0

$arr = array (

0 => array(
    'id' => 1,
    'name' => 'john'
),
1 => array(
    'id' => 4,
    'name' => 'elisabeth'
)
);
foreach($arr as $a)
if($a["id"] == 4)
echo $a["name"];

answered Mar 19 '13 at 16:05

Suyash

625
1
5
22

score 0 · Answer 3 · answered Mar 19 '13 at 16:07

Using array_filter

$arr = array (

    0 => array(
        'id' => 1,
        'name' => 'john'
    ),
    1 => array(
        'id' => 4,
        'name' => 'elisabeth'
    )
);

$id = 1;
$result = array_filter($arr, function($el) use ($id) {
    return $el['id'] == $id;
});
echo '<pre>', var_dump($result), '</pre>';

score 0 · Answer 4 · answered Mar 19 '13 at 16:29

$array = array(
    0 => array(
        'id' => 1,
        'name' => 'john'
    ),
    1 => array(
        'id' => 4,
        'name' => 'elisabeth'
    )
);

$search = 4;
$result = null;

array_walk(
    $array,
    function ($element) use ($search, &$result) {
        if (isset($element['id']) && (int)$element['id'] === (int)$search) {
            $result = $element;
        }
    }
);

var_dump($result);

php two layer array key search

4 Answers4