php - 向回访者和新访问者显示不同的消息

Question

我已经设法存储了访问者的 IP 地址并为他们分配了一个 ID（1、2、3 等），我想向他们显示不同的消息。我到目前为止的代码是这样的：

function DisplayWelcomeMessage() {
    $checkUserIDExists = mysql_query("SELECT * from Information where id = '$myid'");
    if(mysql_num_rows($checkUserIDExists) < 0) {
        return '<div class="Message">New visitor message</div>';
        } else {
        return '<div class="Message">Returning visitor message</div>';
        }
}

当我使用此代码时，它始终显示回访者消息。

Answer 1

Probably the easiest thing to do would be to set a cookie t track if they have visited the site before.

setcookie("FirstVisit", '1');

Then your welcome method would then become something like this:

function DisplayWelcomeMessage()
{
    if (isset($_COOKIE['FirstVisit']) && $_COOKIE['FirstVisit'] == 1)
    {
         // Display a welcome message

         // Update the cookie so that they don't get this message again
         setCookie("FirstVisit", "0");
    }
    else
    {
        // Do something different for people who have visited before
    }
}

You can lookup the documentation for setCookie here