Sharing my code to reserve the numeric keys:
function revise_keys($source)
{
if (!is_array($source)) {
return $source;
}
$target = [];
foreach ($source as $key => $value) {
$target['S' . $key] = revise_keys($value);
}
return $target;
}
function revert_keys($source)
{
if (!is_array($source)) {
return $source;
}
$target = [];
foreach ($source as $key => $value) {
$target[substr($key, 1 - strlen($key))] = revert_keys($value);
}
return $target;
}
function enhanced_array_merge_recursive(...$candidates)
{
$merged = [];
foreach ($candidates as $candidate) {
if (!is_array($candidate)) {
continue;
}
$merged = array_merge_recursive($merged, revise_keys($candidate));
}
return revert_keys($merged);
}
