PHP MySQLi Stored Procedures return call

Question

I cannot figure a way to retrieve the return variable in PHP. It works just perfect in MySQL, but this from PHP doesn't for some reason.

';

        if ($this->multi_query("CALL testOut(@outvar); SELECT @outvar;")) 
        { 
            do 
            { 
                if ($result = $this->store_result()) 
                { 
                    while ($row = $result->fetch_object()) 
                    { 
                        $out[] = $row; 
                    } 

                    $result->close(); 
                } 

                $this->next_result(); 
            } 
            while ($this->more_results()); 
        } 

        var_dump($out); 

        return (array) $out; 
    } 

?>