Recieving a 500 Internal Server error after login success?

Posted by Jeremy Quick on Server Fault See other posts from Server Fault or by Jeremy Quick
Published on 2012-10-29T16:14:37Z Indexed on 2012/10/29 17:04 UTC
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I created my first member login form which takes the typical username and password and then sends it to the code below:

checklogin.php:

    mysql_connect($db_host, $db_username, $db_password) or die(mysql_error()); 
    mysql_select_db($db_database) or die(mysql_error());

    $username=$_POST['username'];
    $password=$_POST['password'];

    $username = stripslashes($username);
    $password = stripslashes($password);
    $username = mysql_real_escape_string($username);
    $password = mysql_real_escape_string($password);

    $sql="SELECT * FROM users WHERE username='$username' and password='$password'";
    $result=mysql_query($sql);

    $count=mysql_num_rows($result);
    if($count == 1) //ERROR APPEARS TO TAKE PLACE HERE
    {
        session_start();
        $_SESSION['username'] = $username;
        $_SESSION['password'] = $password;
        header('login_success.php');
    }
    else {
        header("location:login_fail.php");
    }

If I type in the wrong information everything works properly so I know the error appears to be taking effect in the marked if statement. I have been searching the internet now looking for solutions but none seem to match mine or I am overlooking them. I've made a few changes which brought me to this point, before I was receiving deprecation warnings.

Also, I have checked the logs and they are empty of errors relating to this.

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