Getting an array from one property of an associative array best practice

I have an array of objects eg.

[
array(
'id' => 1,
'name' => "simon"
),
...
]

and I need to get an array of IDs eg.
[1,2,3,4,5];

Currently I'm doing this:

$entities = $this->works_order_model->get_assigned_entities($id);

    $employee_ids = array();

    foreach ($entities as $entity) {
        array_push($employee_ids, $entity->id);
    }

Is there a best practice way of doing this?

I think array_map is what you are looking for:

php > $aa = array (array ("id" => 1, "name" => 'what'), array('id' => 2));
php > function id($i) { return $i['id'];};
php > print_r(array_map ('id', $aa));
Array
(
    [0] => 1
    [1] => 2
)

StackExchange Code Review Q#4610, answer score: 2