<?php
   include("config.php");

   // Processing form data when form is submitted
   if($_SERVER["REQUEST_METHOD"] == "POST") {

      $username = $_POST['username'];
      $password = $_POST['password']);
      $query = "SELECT id FROM users WHERE username = $username and password = $password";
      $result = mysqli_query($db,$query);
      $count = mysqli_num_rows($result);

      if($count == 1) { //If the posted values are equal to the database values, then session will be created for the user
         session_start();
         $_SESSION['login_user'] = $username;
         header("location: member.php");
      }
      else {
         echo  "Invalid username or password";
      }
   }else{
         echo  "Form not being posted";
   }
?>