Question

使用function我可以创建一些参数来显示和隐藏某些内容。

function loggedin(){
    return (isset($_SESSION['UserId'])) ? true : false;
}

if (loggedin() === true){
  echo"Welcome $name";
} else {
  echo"<a href="access.php">Log in</a>";
}

隐藏用户内容的另一种方法如下：

if (loggedin() === false)

如何制作类似的参数来隐藏和显示用户订阅的产品的数据？

也就是说，当您登录已获得或继续订阅产品的用户并且产品的状态为complete时，隐藏价格（或隐藏某些内容）而不是price显示产品文件的下载链接。

如何考虑咨询并显示结果？

我有下面的表名为subscribed，这是这样形成的

id_subscribed | id_product | UserId | number_facture | status  | date |
     1             5          2         4562344       complete   null
     2             5          9         4562345      incomplete  null

产品表

id_product  |  product | price | archive |
    5          null      40.00   data.zip

用户表

UserId  | name  | last_name  | usuername | email | password
  2       Juan       null        juan10   @...    q1dxe333f
  9       Pedro      null        pedro1   @...    wfrf653gg

Answer 1

您可以在“订阅”表格中创建检查产品与用户之间关系的函数（或用户或产品类中的方法）。

使用PDO：

     /**
     * Check if the relationship between product and user 
     * has status completed.
     *
     * @param  int  $id_product
     * @param  int  $UserId
     * @return boolean
     */
    function checkSubscribeComplete($id_product, $UserId = 1)
    {
        global $pdo; // using PDO
        $res = FALSE; // the default result

        /* Just concat the SQL string.
         * can do directly in $pdo->prepare
         */
        $qString = "SELECT status FROM subscribed";
        $qString .= "  WHERE ";
        $qString .= "id_product = :product";
        $qString .= "  AND ";
        $qString .= "UserId = :user";
        $qString .= "  AND ";
        $qString .= "status = 'complete';";

        $query = $pdo->prepare($qString);

        /* bindValue from PDO, 
         * can use directly if injection was not a problem
         */
        $query->bindValue(':product', $id_product, PDO::PARAM_INT);      
        $query->bindValue(':user', $UserId, PDO::PARAM_INT);

        // Here exec the query
        $query->execute();

        // $result is an array of columns
        $result = $query->fetch(PDO::FETCH_ASSOC);

        // if complete is true we expect to have one column.
        if ( count($result) > 0 ) $res = TRUE;

        return $res;
    }

使用MySQLi：

/*Not sure if it's works*/
    /**
     * Check if the relationship between product and user 
     * has status completed.
     * Using MySQLi instead of PDO
     *
     * @param  int  $id_product
     * @param  int  $UserId
     * @return boolean
     */
    function checkSubscribeCompleteMI($id_product, $UserId = 1)
    {
        global $con; // using MySQLI, $con is the connection created before
        $res = FALSE; // the default result

        /* Just concat the SQL string.
         */
        $qString = "SELECT status FROM subscribed";
        $qString .= "  WHERE ";
        $qString .= "id_product = '".$id_product."'";
        $qString .= "  AND ";
        $qString .= "UserId = '".$UserId."'";
        $qString .= "  AND ";
        $qString .= "status = 'complete';";

        // exec the query and get the result
        $result = mysqli_query($con, $qString);

        // count the number of rows in the result
        $total = mysqli_num_rows($result); // return int

        // if "complete" is true we expect to have one row.
        if ( $total > 0 ) $res = TRUE;

        return $res;
    }

希望这会对你有所帮助。

我不知道您是否已使用PDO，无论如何，如果您想了解更多信息，请查看PHP Database Access: Are You Doing It Correctly?

如何显示订阅产品的下载链接？

1 个答案: