PHP array pair: odd as key, even as value

gistfile1.txt

// Based on https://www.sitepoint.com/community/t/reorganizing-an-array-odd-entries-as-key-even-entries-as-value/95548/2
function array_pair($items)
{
    $results = array();
    foreach (array_chunk($items, 2) as $pair) {
        list($key, $value) = $pair+[null,null]; // fix list() issue
        $results[$key] = $value;
    }

    return $results;
}

$items = ['foo', 'bar', 'baz', 'cool', 'world'];
print_r($items);

array(
    'foo' => 'bar',
    'baz' => 'cool',
    'world => null
)