Untitled

<?php
session_start();
if($_SESSION["checkLogin"] == "login" && isset($_SESSION["checkLogin"]))
{
  echo "Please Login!!<br>";
}
$_SESSION["checkLogin"] = "no";
?>
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title> Login </title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
    integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
    integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="js/scr.js"></script>
    <link rel="stylesheet" type="text/css" href="css/00.css">

</head>

  <body>
    <div class="container container-login">
      <form action="login.php" method="POST" name="myFormLogin" id="myFormLogin">
        <div class="form-group has-feedback">
          <label >Username</label>
          <input name="username" type="email"  pattern="[^ @]*@[^ @]*" class="form-control" placeholder="Enter username"
          required=true value="<?php if(isset($_COOKIE['username'])){ echo $_COOKIE['username'];}else if(isset($username)) echo $username;?>">
        </div>

        <div class="form-group has-feedback">
          <label >Password</label>
          <input name="passWord" type="password"  class="form-control"  placeholder="Password" required=true
          value="<?php if(isset($_COOKIE['password'])){ echo $_COOKIE['password'];}else if(isset($password)) echo $password;?>">
        </div>

        <div class="form-check">
          <label class="form-check-label">
            <input type="checkbox" name="rememberMe" class="form-check-input" value="yes" <?php if(isset($rememberMe)) echo $rememberMe;?> >
            Remember me
          </label>
        </div>

        <div class="form-group">
          <button type="submit" class="btn btn-primary"> Submit </button>
        </div>
      </form>
    </div>


  </body>
</html>
<?php
  if($_SERVER["REQUEST_METHOD"] == "POST")
  {
    require_once 'config.php';
    $username=$_POST['username'];
    $password=$_POST['passWord'];
    if(isset($_POST['rememberMe']))
    {
      $rememberMe=$_POST['rememberMe'];
    }
    else{
      $rememberMe="no";
    }
    if($rememberMe == "yes")
    {
      $hour = time() + 3600 * 24 * 30;
      setcookie('username', $username, $hour);
      setcookie('password', $password, $hour);
    }
    else if($rememberMe == "no")
    {
      setcookie("username", "", time() - 3600);
      setcookie("password", "", time() - 3600);
    }

    $sql="select * from users where username=:username";
    $stmt= $pdo->prepare($sql);
    $stmt->bindParam(':username',$username,PDO::PARAM_STR);
    $stmt->execute();
    if($stmt->rowCount()==1){
       $password_hash=password_verify($_POST['passWord'], $existingHashFromDb);
        $row=$stmt->fetch();
        $hasspassword= password_verify($row['passWord'], $existingHashFromDb);
        if($password_hash == $hasspassword)
        {
            session_start();
            $_SESSION['username']=$username;
            header('Location:mytable.php');
        }
        else{
        header('Location:login.php');
        }
    }
  }
  ?>