PHP多维数组按照首字母排序（不区分大小写）

$PDOresult = array(
    array('name' => 'Alpha', 'price' => '10'),
    array('name' => 'beta', 'price' => '12'),
    array('name' => 'Gamma', 'price' => '14'),
    array('name' => 'delta', 'price' => '16'),
    array('name' => 'Epsilon', 'price' => '18'),
    array('name' => 'zeta', 'price' => '20'),
   array('name' => 'acc', 'price' => '10'),
);

$sort_by = array_column($PDOresult, 'name');

array_multisort($sort_by, SORT_ASC, SORT_NATURAL|SORT_FLAG_CASE, $PDOresult);

var_dump($PDOresult);