<?php
$error=''; //Variable to Store error message;
if(isset($_POST['submit'])){
    if(empty($_POST['username']) || empty($_POST['password'])){
    $error = "Username or Password is Invalid";
    }
    else
    {
    //Define $user and $pass
    $username=$_POST['username'];
    $password=$_POST['password'];
    //Establishing Connection with server by passing server_name, user_id and pass as a patameter
    $conn = mysqli_connect("localhost", "root", "root");
    //Selecting Database
    $db = mysqli_select_db($conn, "company");
    //sql query to fetch information of registerd user and finds user match.
    $query = mysqli_query($conn, "SELECT * FROM userpass WHERE password='$password' AND username='$username'");

    $rows = mysqli_num_rows($query);
    if($rows == 1){
    header("Location: welcome.php"); // Redirecting to other page
    }
    else
    {
    $error = "Username or Password is Invalid";
    }
    mysqli_close($conn); // Closing connection
    }
    }

?>