in bits/opcache-instance-id.php [272:285]
private function _arrayPset(&$array, $key, $value)
{
if (is_null($key)) return $array = $value;
$keys = explode(DIRECTORY_SEPARATOR, ltrim($key, DIRECTORY_SEPARATOR));
while (count($keys) > 1) {
$key = array_shift($keys);
if ( ! isset($array[$key]) || ! is_array($array[$key])) {
$array[$key] = array();
}
$array =& $array[$key];
}
$array[array_shift($keys)] = $value;
return $array;
}