private function __isValidRequest($field, $array = 'post')
{
$field = is_array($field) ? $field : explode(',', $field);
$array = $array == 'post' ? $_POST : $_GET;
foreach ($field as $v) {
$v = trim($v);
if (!isset($array[$v]) || $array[$v] == '') {
return false;
}
}
return true;
}