Session_Start(); being annoying :s

[Roon]

Okay, so my code in the whole page is...

<?php
class forum {
    public function connect() {
        $con = mysql_connect('');
        mysql_select_db('forum', $con);
    }
    public function login() {
        $Username = $_POST['Username'];
        $Password = $_POST['Password'];
        $fetch_Username = mysql_query("SELECT * FROM `users` WHERE `Username` = '$Username'");
        $fetch_Password = mysql_query("SELECT * FROM `users` WHERE `Password` = '$Password'");
        $row_U = mysql_num_rows($fetch_Username);
        $row_P = mysql_num_rows($fetch_Password);
 
        if($row_U && $row_P == 1){
            session_start();
            $_SESSION['Username'] = $Username;
            header('Location: ../index.php');
        }
        else {
            header('Location: ../loginfailed.php');       
        }
}
    public function loginouty() {
        session_start();
        if(!isset($_SESSION['Username'])) {
        echo "<form style=\"display: inline-block; position: absolute; right: -1050px;\" action=\"inc/inc.main.php\" method=\"POST\" name=\"Form-Login\">
                      <input style=\"margin-top:5px;\" type=\"text\" id=\"loginname\" class=\"input-small\" placeholder=\"Username\" name=\"Username\">
                        <input style=\"margin-top:5px;\" type=\"password\" id=\"loginpass\" class=\"input-small\" placeholder=\"Password\" name=\"Password\">
                        <input type=\"button\" id=\"loginsub\" class=\"btn btn-inverse\" value=\"Login\" name=\"Login-Button\">
                    <input type=\"submit\" id=\"realloginsub\" class=\"btn btn-inverse\" value=\"Login\" name=\"Login-Form-Button\">
                </form>";       
        }   
        else {
        $Username = $_SESSION['Username'];
        echo "<form action=\"logout.php\" style=\"display: inline-block; position: absolute; right: -1050px;\">
                    <input type=\"submit\" class=\"btn btn-danger\" value=\"Logout\">
                </form>";
        echo "    <div style=\"margin-top: 3.5px; display: inline-block; position: absolute; right: -965px;\" class=\"btn-group\">
    <button class=\"btn\">$Username</button>
    <button class=\"btn dropdown-toggle\" data-toggle=\"dropdown\">
    <span class=\"caret\"></span>
    </button>
    <ul class=\"dropdown-menu\">
    <li class=\"divider\"></li>
    <li><a style=\"text-align: center;\" href=\"account.php\">My Account</a></li>
    <li><a style=\"text-align: center;\" href=\"settings.php\">Settings</a></li>
    <li class=\"divider\"></li>
    <li><a style=\"text-align: center;\" href=\"#\">New Status</a></li>
    <li><a style=\"text-align: center;\" href=\"#\">New Avatar</a></li>
    <li class=\"divider\"></li>
    </ul>
    </div>";                   
        }
}
}
    class amlinks {
        public function amlinker()    {
            $Username = $_SESSION['Username'];   
            $aretheyMOD = mysql_query("SELECT * FROM `users` WHERE `Username` = '$Username' AND `isMod` = '1'");
            $aretheyADMIN = mysql_query("SELECT * FROM `users` WHERE `Username` = '$Username' AND `isAdmin` = '1'");
            $rows_MOD = mysql_num_rows($aretheyMOD);
            $rows_ADMIN = mysql_num_rows($aretheyADMIN);
            if($rows_MOD == 1) {
            echo "<form style=\"display: inline-block; position: absolute; right: -800px; margin-top: 6px;\" action=\"mod/modcp.php\"><input class=\"btn-small btn-primary\" type=\"submit\" value=\"MCP\"></input></form>";
            }
            if($rows_ADMIN == 1) {
            echo "<form style=\"display: inline-block; position: absolute; right: -870px; margin-top: 6px;\" action=\"admin/admincp.php\"><input class=\"btn-small btn-danger\" type=\"submit\" value=\"ACP\"></input></form>";
           
 
        }   
    }
}
 
    $forum = new forum;
    $forum->connect();
    $ams = new amlinks;
?>
<?php   
    if(isset($_POST['Login-Form-Button'])) {
        $forum->login();
}
?>

And my error is
Notice: Undefined variable: _SESSION in D:\Xampp\htdocs\ForumZer\inc\inc.main.php on line 59

However, when I do "session_start();" it says
Notice: Undefined index: Username in D:\Xampp\htdocs\ForumZer\inc\inc.main.php on line 60

Notice: A session had already been started - ignoring session_start() in D:\Xampp\htdocs\ForumZer\inc\inc.main.php on line 25

I am completely oblivious as to why this is happening and I would appreciate some help. Thanks!


I

 

[Ecko]

Use isset() to check if the session is even there in the amlinker() function

 

[Markshall]

You're calling session_start(); within specific functions, put it at the top of your script under the PHP opening tags (<?php) or if that fails, when you declare a function, try 'global $_SESSION;'

For example:

public function amlinker() {
    global $_SESSION;
    //..rest of your code...
}

 

[Roon]

Thanks, m0nsta. That did the trick. You're very useful

 

[Markshall]

Problem solved. Closed.