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

  if(isset($_POST[user_form])){
    $sqlquery = mysqli_query($link,"SELECT * FROM login_user WHERE username ='$username' AND password = md5('$password')");
    $username = mysqli_real_escape_string($link,stripslashes($_POST['username']));
    $init_password = mysqli_real_escape_string($link,stripslashes($_POST['password']));
  }
?>