会话注册不起作用

Question

I'm trying to make a login page. When I try to register the username as a session it should redirect me to another page, where it checks if that session is not registered. if it isn't, it redirects me back to the login page. well, i think it fails on the second page.

Login.php:

if($count==1){$_SESSION['user'] = $username;$_SESSION['pass'] = $password;header("location:Login_Success.php");}
else{echo "<p style='color:red'>Wrong username or password!</p>";}

login_success.php:

session_start();
if(!isset($_SESSION['username'], $_SESSION['password'])){
header("location:login.php");}

The error: IT DOES NOT REGISTER THE SESSION! I know that because I replaced the header("location:url"); with an echo "What the--?!" , and it displayed "What the--?!".

THE ANSWER

The session's value wasn't right. Here's the new code:

Login.php:

if($count==1){$_SESSION['user'] = "username" //Here was the problem
or die(mysql_error());header("location: Login_Success.php");}
else{echo "<p style='color:red;margin-left:150px;'>Wrong username or password!</p>";}

Login_Success.php:

session_start();
if($_SESSION['user']!="username")//"username" is here too
{header("location: login.php");}

Answer 1

add

session_start();

at the begining of your pages. even before doctype or any html code.
in fact before any printable code.

Answer 2

You are missing session_start(); on the begining of your code.

session_start(); //This will get you connected with your previous session

if($count==1){$_SESSION['user'] = $username;$_SESSION['pass'] = $password;header("location:Login_Success.php");}
else{echo "<p style='color:red'>Wrong username or password!</p>";}