/**
* constructor
* @param array $array
* @param array $keys
*/
public function __construct(array $array, array $keys)
{
array_walk($keys, function ($k) {
if (!is_string($k)) {
throw new RuntimeException("Keys must only be string");
}
});
$this->keys = $keys;
$this->flip = array_flip($keys);
$arrkeys = array_keys($array);
if (!empty(array_diff($arrkeys, $keys)) || !empty(array_diff($keys, $arrkeys))) {
throw new RuntimeException("keys missmatching");
}
parent::__construct($array);
}
