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Edit File: login.php

<?php
session_start();
session_set_cookie_params(7200,"/");
error_reporting(E_ALL);
ini_set("display_errors", 0);
//include 'session.php';
//die(__FILE__);
//session_start();
//session_set_cookie_params(86400,"/");
include 'reader.php';
//
include('Models/ConDB.php');
$db = new ConDB();
  
   $error='';  
 
   if($_SERVER["REQUEST_METHOD"] == "POST") {
   //   var_dump($_POST);     
    // username and password sent from form 
      $username = $_POST['name'];
      $password = $_POST['password']; 
    
        $sql = "SELECT id,username FROM admin_pass WHERE username = '$username' and password = '$password' ";
    //  $result = mysql_query($sql, $db->conn);
      if(!$result = $db->db->query($sql)){
        die('There was an error running the query [' . $db->db->error . ']');
      }

//  $count = mysql_num_rows($result);
      // If result matched $myusername and $mypassword, table row must be 1 row
  
       $count = $result->num_rows;
       $row = $result->fetch_assoc();
       $id = $row['id'];
       $user = $row['username'];

if($count == 1) {

//   session_register("myusername");
        $_SESSION['user'] = $username;
           header("location: merchant.php");
      }else {
          $error = "Your Login Name or Password is invalid";
     
      }
   }
        
?>

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Pinnacle - Login</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<style>
.customdiv
{

padding-top: 30px;
    padding-right: 30px;
    padding-bottom: 1px;
    padding-left: 50px;
   
}

</style>
<body>

</div>
    <div class="form-group">
      <label for="pwd"></label>
      <input type="password" class="form-control" placeholder="Password" required="" name="password" required />
    </div><br>

<div align="center">
 <a href="forgot_password.php">Forgot Password ?</a><br><br>
  <button  type="submit"  class="btn btn-default" name="update" style="color:white;background-color:#e31e27;">Log In</button><br><br>
<span style="color:red"; ><?php echo $error ; ?> </span>

</div>
</div>
</div>
</div>
</div>
</body>
</html>