- array_column: documentation ( source)
- array_search: documentation ( source)
<?php
$var = Array(
[0] => Array
(
[id] => 1,
[box] => 0
),
[2] => Array
(
[id] => 2,
[box] => 0
),
[3] => Array
(
[id] => 3,
[box] => 1
)
);
echo $index = array_search(array_column($var, 'box'), 1);