php讓一個數組按照另外一個數組的鍵名進行排序

$a = [
    'id',
    'name',
    'identityId',
    'phone',
    'email',
    'schoolId'
];

$b = [
    'id' => '唯一標識',
    'identityId' => '身份證',
    'phone' => '手機號',
    'email' => '郵箱',
    'name' => '姓名',
    'schoolId' => '學校'
];

var_dump(array_merge(array_flip($a), $b));