将子数组的值传递给key

Question

I have this array :

$arr = array(0 => array('id' => "AMO"), 1 => array('id' => "PAT"));

And I would like to obtain this one :

array(
'AMO' => array(),
'PAT' => array()
)

How could I do this, in the shortest way possible ?

I can do it with an array_map, followed by an array_flip and next an array_walk .. but too long.

Answer 1

array_column to extract the keys and array_fill_keys to create the new array:

$arr = array(0 => array('id' => "AMO"), 1 => array('id' => "PAT"));

$res = array_fill_keys(array_column($arr, 'id'), []);