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Asked: 2026-05-21T22:20:47+00:00

I been doing alot of research with php logins and how they work for

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I been doing alot of research with php logins and how they work for a while. I came across this site a couple of days ago. http://www.intechgrity.com/create-login-admin-logout-page-in-php-w/#comment-25300. Looking at it I notice that it was using session_register which is a huge problem in PHP 5.3. I begin playing around with it and I got the login part to work with no problem, but for some reason I can’t get the username to show in the header of the admin page. What I want is: <h1>Welcome To Admin Page Username</h1> and it gives me <h1>Welcome To Admin Page</h1>. I was wondering if it’s because I have 2 sessions using the same var?

My changes from the tutorial:

check_login.php – 

    <?php
define(DOC_ROOT,dirname(__FILE__)); // To properly get the config.php file
$username = $_POST['username']; //Set UserName
$password = $_POST['password']; //Set Password
$msg ='';
if(isset($username, $password)) {
    ob_start();
    include(DOC_ROOT.'/config.php'); //Initiate the MySQL connection
    // To protect MySQL injection (more detail about MySQL injection)
    $myusername = stripslashes($username);
    $mypassword = stripslashes($password);
    $myusername = mysqli_real_escape_string($dbC, $myusername);
    $mypassword = mysqli_real_escape_string($dbC, $mypassword);
    $sql="SELECT * FROM login_admin WHERE user_name='$myusername' and user_pass=SHA('$mypassword')";
    $result=mysqli_query($dbC, $sql);
    // Mysql_num_row is counting table row
    $count=mysqli_num_rows($result);
    // If result matched $myusername and $mypassword, table row must be 1 row
    if($count==1){
        // Register $myusername, $mypassword and redirect to file "admin.php" 
        $_SESSION["admin"]= $myusername;
        $_SESSION["password"]= $mypassword;
        $_SESSION["name"]= $myusername;
        header("location:admin.php");
    }
    else {
        $msg = "Wrong Username or Password. Please retry";
        header("location:login.php?msg=$msg");
    }
    ob_end_flush();
}
else {
    header("location:login.php?msg=Please enter some username and password");
}
?>

admin.php – 

<?php
session_start(); //Start the session
define(ADMIN,isset($_SESSION["name"])); //Get the user name from the previously registered super global variable
if(isset($_SESSION["admin"])){ //If session not registered
header("location:login.php"); // Redirect to login.php page
}
else //Continue to current page
header( 'Content-Type: text/html; charset=utf-8' );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Welcome To Admin Page Demonstration</title>
</head>
<body>
    <h1>Welcome To Admin Page <?php echo ADMIN /*Echo the username */ ?></h1>
    <p><a href="logout.php">Logout</a></p> <!-- A link for the logout page -->
    <p>Put Admin Contents</p>
</body>
</html>

These are the only 2 pages I did changes. Thanks for any help.

UPDATE: I tired the changes from everyone who answer and still got a blank. I just going to give up on it. It puzzles me how it work with the old code but not with the new code. Thanks for all the help.

UPDATE 2: Got it to work thanks to Gumbo suggestion about using var_dump();. What I did is I took everything from *check_login.php* and placed it into the admin.php and went from array(0){} to array(3) { ["username"]=> string(6) "admin" ["admin"]=> string(6) "admin" ["password"]=> string(5) "************" }.

Thanks everyone for all of your help.

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1 Answer

  1. Editorial Team

    isset does only return a boolean value depending on whether the given variable exists or not; but it does not return the variable value if it exists.

    Do this instead:

    session_start();                  // Start the session
if (!isset($_SESSION["admin"])) { // If session not registered
    header("location:login.php"); // Redirect to login.php page
    exit;                         // Stop execution of current script
} else {
    header('Content-Type: text/html; charset=utf-8');
    define('ADMIN', $_SESSION["name"]); //Get the user name from the previously registered super global variable
}

    And note that you’ve used $_SESSION["name2"] and not $_SESSION["name"] in your check_login.php.

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