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Editorial Team
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Asked: 2026-06-18T04:07:58+00:00

Another Update! 2/2/13 Updated PHP to version 5.3 and it now gives me this

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Another Update! 2/2/13
Updated PHP to version 5.3 and it now gives me this message,

Fatal error: Uncaught exception ‘PDOException’ with message ‘You cannot serialize or unserialize PDO instances’ in [no active file]:0 Stack trace: #0 [internal function]: PDO->__sleep() #1 {main} thrown in [no active file] on line 0

However, I’m not using the serialize or unserialize function…

Update!

This works, but it is the incorrect and ugliest way of doing it. And I don’t want to do it like this, but I figured that it might help

$db    = new PDO("mysql:host=127.0.0.1;dbname=dbname;", "user", "pass");
public function login($user, $pass) {
    global $db;
    //stuff
}

ORIGINAL POST

I just switched over my project files to my web host (it works perfectly locally).

I’m getting this error, Fatal error: Exception thrown without a stack frame in Unknown on line 0.

It is oh so helpful. I am only including one file right now, it’s a class with one function which counts the IDs of the entered username and password and then either returns true or false depending on what it found. (1 = true, anything but 1 = false).

I’m using PDO (mysql), and if I don’t connect to my database I don’t get the error but if I remove the session_start(); from the top of my document I also don’t get the error.
private $db;

public function __construct() {
    $this->db = new PDO("mysql:host=127.0.0.1;dbname=dbname;", "user", "pass");
    $this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}

And this is where I set the session,

if(isset($_POST["submit"])) {
    $errors = array();
    if($user->login($_POST["user"], $_POST["pass"]) === false) {
        $errors[] = "Username or password is incorrect";
    }
    if(empty($errors)) {
        $_SESSION["user"] = $_POST["user"];
        header("Location: index.php");
    }
}

I am not actually throwing an exception, anywhere. I don’t know what this error means. I am running PHP Version 5.2.17

Here is my login function,

public function login($user, $pass) {
    $sql = $this->db->prepare("SELECT COUNT(`id`) FROM `users` WHERE `username` = :user AND `password` = :pass");
    $sql->bindParam(":user", $user);
    $sql->bindParam(":pass", $pass);
    $sql->execute();

    return ($sql->fetchColumn() == 1) ? true : false;
}

Index page (error occurs on every page that uses session_start, index page and login page)

session_start();
if(!isset($_SESSION["user"])) {
    header("Location: login.php");
}else {
    //begin HTML, no more php after this (except the closing bracket)
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1 Answer

  1. Editorial Team

    I renamed the session to “username” instead of “user” and then it started working. I called my user class for $user so I guess something went terribly wrong when I tried to name a session the same. Which is still terribly weird because $user is a variable and “user” is a string >_>

    Anyways, problem has been resolved, thank you PHP for being rather dumb sometimes.

    Update

    The culprit this entire time was register_globals in the PHP.ini. It was turned off on my local server but it was turned on, on my host.

    It’s turned off now though, everywhere. I thought I might add this in case some runs into this problem in the future.

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