設定路由 /application/config/routes.php

$route['api/v1/url/(:any)']['put'] = '/api/v1/url/edit/$1';

寫Controller application/controllers/api/v1/url.php

public function edit($shorten_url) {
    if (!$shorten_url || $shorten_url == '') {
        http_response_code(400); //HTTP 400 - Bad Request
    }

    parse_str(file_get_contents('php://input'), $_PUT); //設定$_PUT，因為php預設沒有$_PUT
        $database = $this->load->database('default',true); //設定database連線
        $query = $database
            ->from('urls')
            ->where('url_shorten',$shorten_url)
            ->get();
        if (!$query->num_rows() > 0) { //查詢資料庫是否有這筆紀錄
            show_404(); //如果沒有回覆HTTP 404 - Not Found
            die(); //結束程式
        }
        $database
            ->set("url_dest", $_PATCH['new_url_dest'])
            ->where('url_shorten',$shorten_url)
            ->update('urls',$dbdata); //寫入database
        if ($$database->error()['code'] != 00000) { //如果發生DB Error
            print_r(
                json_encode(
                    array(
                        'status' => 'error',
                        'message' => 'an database error occurred',
                        'code' => $dberror['code'],
                    )
                )
            );
            http_response_code(500);
            die();
        }
        print_r(
            json_encode(
                array(
                    'status' => 'success'
                )
            )
        );
}