<?php

$rawitems = [['nope1' => 'a', 'nope2' => 'b'], ['nope1' => 'c', 'nope2' => 'd']];
$itemskey = ['key1', 'key2'];
foreach  ($rawitems as $row) {
	$tmp = array_combine($itemskey, $row);
	$tmp['key2'] = [$tmp['key2']];
	$items[] = $tmp;
}

print_r($items);