Question

This is the array I want to extract from:

Array
    (
        [0] => Array
            (
                [id] => 11
                [order_id] => 6127
            )

        [1] => Array
            (
                [id] => 12
                [order_id] => 6123
            )

    )

This is what I need:

$results = array()
$results(6127, 6123)

There can be any number of arrays within the first array.

Answer 1

Iterate through the array then add the order ids to another array:

$results = array();
foreach($arr as $item)
{
    $results[] = $item['order_id'];
}