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CheckLogin.php

if ( $count == 1 )  {
    $_SESSION['login_id'] = $row['id'];
    $_SESSION['username'] = $row['username']; // added

    if ( $_SESSION['login_id'] != '' || $_SESSION['login_id'] > 0 ) { // edited
        header("location: index.php");  
    } else { 
        header("location: login3.html");  
    }
}

Index.php

<?php
    require_once 'UserSessionAdmin.php'; // edited
    $username = $_SESSION['username']; // added
?>

<!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">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>DASHBOARD</title>
    <link rel="stylesheet" type="text/css" href="css.css"/>
</head>

<body>
<?php echo $username; ?> // edited


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