成员和访客计数器下面的代码。代码运行完美,但是当我向表active_members添加简单列(在线)时,整个代码停止工作(除了active_guests之外,这是一个单独的表)
我已经不知疲倦地尝试捕获可能导致此问题的任何内容,下面提供了表格截图。我本来要向表members_online添加一个新列(在线)即varchar,然后在下面的if SESSION中查询该新列。
为什么代码停止工作,有人可以看到原因或解决方案吗?
一旦我删除了在线专栏,代码就会再次完美运行。
$ sqlt2查询下面是我要索引新的在线列的行。
include('..\db.php');
$con = mysqli_connect($dbsrvname, $dbusername, $dbpassword, $dbname);
//declare variables
$guest_timeout = time() -1 * 60;
$member_timeout = time() -1 * 60;
$guest_ip = $_SERVER['REMOTE_ADDR'];
$time = time();
// if the session is set PUTS THE USER IN MEMBERS TABLE
if(isset($_SESSION['CurrentUser'])){
//if user is logged in
$sqlt = mysqli_query($con,"DELETE FROM active_guests WHERE guest_ip='".$guest_ip."'");
**//I WANT TO ADD TO THE ONLINE COLUMN AND REPLACE A SIMPLE STRING INTO ONLINE**
$sqlt2 = mysqli_query($con,"REPLACE INTO active_members VALUES ('".$_SESSION['CurrentUser']."','".$time."')");
$name = $_SESSION['CurrentUser'] ;
}else{
//if user not in a session PUTS THE USER IN GUESTS TABLE
$sqlt3 = mysqli_query($con,"REPLACE INTO active_guests (guest_ip,time_visited)VALUES ('".$guest_ip."','".$time."')");
}
//execute querys
$sqlt4 = mysqli_query($con,"DELETE FROM active_guest WHERE time_visited < ".$guest_timeout);
$sqlt5 = mysqli_query($con,"DELETE FROM active_members WHERE time_visited < ".$member_timeout);
$sqlt6 = mysqli_query($con,"SELECT guest_ip FROM active_guests");
$sqlt7 = mysqli_query($con,"SELECT username FROM active_members");
$online_guests = mysqli_num_rows($sqlt6);
if(isset($_SESSION['CurrentUser'])){
$sqlt7 = mysqli_query($con,"SELECT username FROM active_members");
if($sqlt7->num_rows){
while($row = $sqlt7->fetch_object())
{
echo '<pre>',$row->username,'</pre>' ;
}
//$result->free();
}
}else{
echo "Login to see members-online list";
}
$online_members = mysqli_num_rows($sqlt7);
?>
// display results
<div class="container">
<p>_________________________</p>
<p>online Guests : <?php echo $online_guests ; ?></p>
<p>online Members : <?php echo $online_members ; ?></p>
</div>
最佳答案
将“在线”列的“默认/表达式”设置为null,希望它将起作用!
关于php - 我在表中添加新列后代码停止工作,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/38220308/