DB::nonSQLError PHP 메소드

    public static function nonSQLError()
    {
        $args = func_get_args();
        return call_user_func_array(array(DB::getMDB(), 'nonSQLError'), $args);
    }

 function __construct($type)
 {
     $type = strtolower($type);
     if ($type !== 'or' && $type !== 'and') {
         DB::nonSQLError('you must use either WhereClause(and) or WhereClause(or)');
     }
     $this->type = $type;
 }