注销代码根本不执行。 PHP

Question

Here is the code

I dont know whats wrong with it.

<?php
       //Logout code
       //Starting Session
       session_start();
       //Include
       include ("includes/mass.php");
       //Check if the user is logged in
       $username = $_SESSION['username'];
       $logged_in_query = "SELECT * FROM    user WHERE loggedin='1' AND    username='$username'";
       $check_if_logged_in =    mysql_query($logged_in_query);
       if (isset($username))

    {       while ($row =    mysql_fetch_array($check_if_logged_in))

            {
                $logged_in = $row['loggedin'];

                if ($logged_in == 1)

                    {
                    //User becomes logged out on database records

                    $sql_logout = "UPDATE user SET loggedin='0' WHERE loggedin='1' AND    username='$username'";

                    $logout_query = mysql_query($logout_query);

                    //Logout page

                    session_destroy();

                    echo "You have been logged out.","<br>"."<a    href='index.php'>Click Here To Go    Back</a>";
                    }
                            }
                }                else

    {
                                echo"You are not logged in"."<br><a href='register.php'>Click    To Sign Up</a>";
                            }           
         ?>

Answer 1

Do you have a mysql link object (from mysql_connect() / mysql_select_db() ?) From your comments below, it doesn't sound that way.

This SQL is wrong:

$sql_logout = "UPDATE user WHERE loggedin='1' AND username='$username'";

Should be:

$sql_logout = "UPDATE user SET loggedin=0 WHERE loggedin='1' AND username='$username'";

?

You probably also mean to be using mysql_fetch_assoc() instead of mysql_fetch_array().

This line:

$logout_query = mysql_query($logout_query);

Should be

$logout_query = mysql_query($sql_logout);

Put in your correct mysql connection and db information and try to run this. Please post the output.

<?php
//Logout code
//Starting Session
session_start();

echo "hello<br />";

//Include
include ("includes/mass.php");

echo "no problem in mass.php!<br />";

// FILL ME IN
$my_link = mysql_connect($server, $username, $password, TRUE);
mysql_select_db('your_db', $link);

//Check if the user is logged in
$username = $_SESSION['username'];
$logged_in_query = "SELECT loggedin FROM user WHERE loggedin='1' AND username='$username'";
echo $logged_in_query . "<br />";

$check_if_logged_in = mysql_query($logged_in_query, $my_link);
var_dump(mysql_num_rows($check_if_logged_in));

if (isset($username))
{
    while ($row = mysql_fetch_assoc($check_if_logged_in))
    {
        var_dump($row);

        $logged_in = $row['loggedin'];

        if ($logged_in == 1)
        {
            //User become logged out on database records
            $sql_logout = "UPDATE user SET loggedin=0 WHERE loggedin='1' AND username='$username'";
            $logout_query = mysql_query($sql_logout, $my_link);

            //Logout page
            session_destroy();
            echo "You have been logged out.","<br>"."<a href='index.php'>Click Here To Go Back</a>";
        }
        else
        {
            echo"You are not logged in"."<br><a href='register.php'>Click To Sign Up</a>";
        }
    }
}
?>