PHP共享代码

我有一个类文件，在类文件中有一些代码。如何跨多个页面共享代码。这段代码处理了在使用预处理语句

代码如下。我如何重用函数mps_fetch_assoc。我希望代码只在一个地方。

<?php
//http://localhost:8080/altenaontw/index.php?-action=showclient
class actions_showclient
{
    // find here http://www.meetup.com/austinphp/messages/boards/thread/2022681
    private function mps_fetch_assoc(&$stmt)
    {
        $meta = $stmt->result_metadata();
        $retval[] = &$stmt;
        $tmp;
        $names;
        while ($field = $meta->fetch_field())
        {
            $names[] = $field->name;
        }
        $tmp = $names;
        for ($c = 0; $c < count($names); $c++)
        {
            $retval[] = &$tmp[$c];
        }
        call_user_func_array("mysqli_stmt_bind_result", $retval);
        if ($stmt->fetch())
        {
            $assoc_array;
            for ($c = 0; $c < count($names); $c++)
            {
                $assoc_array[$names[$c]] = $retval[$c + 1];
            }
            return $assoc_array;
        }
        else
        {
            return FALSE;
        }
    }
    function handle($params)
    {
        header('Content-type: text/json; charset="UTF-8"');
        $user = Dataface_AuthenticationTool::getInstance()->getLoggedInUser();
        if (!$user)
        {
            return Dataface_Error::permissionDenied("U heeft geen toegang tot deze actie.");
        }
        $db = Dataface_Application::getInstance()->_conf['_database'];
        echo ($db['host']);
        //$mysqli = new mysqli($db['host'], $db['user'], "", $db['name']);
        $mysqli = mysqli_connect($db['host'], $db['user'], "", $db['name']);
        /* check connection */
        if ($mysqli->connect_errno)
        {
            printf("Connect failed: %s'n", $mysqli->connect_error);
            exit();
        }
        $sql = 'SELECT * from client';
        $stmt = $mysqli->prepare($sql);
        if ($stmt)
        {
            $result = $stmt->execute();
            if (!$result)
            {
                echo "[" . json_encode(array('dberror' => 'db_error:' . mysql_error())) . "]";
                return;
            }
            $rows = array();
            while ($row = $this->mps_fetch_assoc($stmt))
            {
                $rows[] = $row;
            }
            print json_encode($rows);
            $mysqli->close();
        }
    }
}
?>