Difficulty: beginner
Table: "user_online"
Columns:
- session (VARCHAR 45)
- time (INT 30)
- username (VARCHAR 30)
Code: Select all
// Check to see if user is signed in. the below code portion can go in your header.php, which is included on every page.
if (isset($session_username))
{
// set session variables, time calc, etc.
$session=session_id();
$time=time();
$time_check=$time-600;
// The query below checks to see if the player's session already exists
$sql="SELECT * FROM user_online WHERE session='$session'";
$result=mysql_query($sql);
$count=mysql_num_rows($result);
if($count=="0")
{
// if $count == 0 means there are no results back from the above query, so its fine to insert a new session for the player
$sql1="INSERT INTO user_online(session, time, user)VALUES('$session','$time','$username')";
$result1=mysql_query($sql1);
}
else
{
// if $count did not = 0, and instead there was a result, this means the session already exists in the database table "user_online", so instead of inserting a new session, we update its time!
"$sql2=UPDATE user_online SET time='$time' WHERE session='$session'";
$result2=mysql_query($sql2);
}
// The portion below checks to see if the session is old/inactive, if this is true, the session is deleted from the user_online table
$sql3="SELECT * FROM user_online";
$result3=mysql_query($sql3);
$count_user_online=mysql_num_rows($result3);
// if over 10 minute, delete session
$sql4="DELETE FROM user_online WHERE time<$time_check";
$result4=mysql_query($sql4);
}
Code: Select all
// the portion below lists those players that are in the user_online table
$sqlonline="SELECT user FROM user_online";
$resultonline=mysql_query($sqlonline);
$count_user_online=mysql_num_rows($resultonline);
if ( $count_user_online == 0)
{
$count_user_online = '0';
}
echo "<center><table width='800' bgcolor='#090401'><tr><td><center>";
{
echo "<small>There are $count_user_online users online<br><br><b>Users Online:</b><br></small>";
}
if ( $count_user_online > 1)
{
$comma = ",";
}
if ( $count_user_online > 0)
{
while($rowonline = mysql_fetch_array($resultonline))
{
echo "".$rowonline['user']."$comma ";
}
}
echo "</td></tr></table>";
