password.php

<?php
// Try and keep this file out of the main website folder

/* Check Login form submitted */
        if(isset($_POST['Submit'])){
                /* Define username and associated password array */
                $logins = array('YOUR USERNAME' => 'YOUR PASSWORD');
                /* Check and assign submitted Username and Password to new variable */
                $Username = isset($_POST['Username']) ? $_POST['Username'] : '';
                $Password = isset($_POST['Password']) ? $_POST['Password'] : '';
                /* Check Username and Password existence in defined array */
                if (isset($logins[$Username]) && $logins[$Username] == $Password){
                        /* Success: Set session variables and redirect to Protected page  */
                        $_SESSION['UserData']['Username']=$logins[$Username];
                        header("location:index.php");
                        exit;
                } else {
                        /*Unsuccessful attempt: Set error message */
                        $msg="<span style='color:red'>Invalid Login Details</span>";
                }
        }

?>