function _complexMerge($arr1, $arr2, $opt)
{
$r = (array) $arr1;
foreach ((array) $arr2 as $key => $val) {
if ($opt['sequences'] === 'first' && is_int($key)) {
$r[] = $val;
} elseif ($opt['curDepth'] < $opt['depth'] && is_array($val) && isset($r[$key]) && is_array($r[$key])) {
$subOpt = $opt;
$subOpt['curDepth']++;
$r[$key] = SetMulti::_complexMerge($r[$key], $val, $subOpt);
} elseif ($opt['sequences'] && is_int($key)) {
$r[] = $val;
} else {
$r[$key] = $val;
}
}
return $r;
}