public function offsetUnset($offset)
{
Debug::checkArg(0, 1, 'array or string', $offset, 1, 'nonempty', $offset);
if (is_array($offset)) {
$config =& $this->_config;
foreach ($offset as $key) {
if (!isset($config[$key])) {
throw new Iae("Undefined index: {$key}");
} else {
if ($key == end($offset)) {
unset($config[$key]);
} else {
$config =& $config[$key];
}
}
}
} else {
if (isset($this->_config[$offset])) {
unset($this->_config[$offset]);
} else {
throw new Iae("Undefined index: {$offset}");
}
}
}
