Simple PHP script to protect any PHP page using session

SimpleAuth.php

<?php
/*
 * Filename: SimpleAuth.php
 * Version: 1.0
 * Author: Heiswayi Nrird
 * Dscription: Simple PHP script to protect any PHP page using session
 * Website: https://heiswayi.nrird.com
 *
 * HOW TO USE
 * ==========
 * Just include this code snippet on the top of your PHP page you want to protect:
 * ```
 * <?php
 * session_start();
 * require("SimpleAuth.php");
 * $login = new Login;
 * $login->authorize();
 * ?>
 * ```
 *
 * To logout, put this line of action URI at the end of your page name:
 * Example:
 * <a href="index.php?action=clear_login">Logout</a>
 *
 */

// SETTINGS
// ------------------------------------------------------------------------------------------------
// Set your username
define('LOGIN_USER', "wayi");
// Set your password
define('LOGIN_PASS', "wayi123");

// LANGUAGES
// ------------------------------------------------------------------------------------------------
define('LOGOUT_COMPLETE', "You've been successfully logged out.");
define('INCORRECT_USERNAME_PASSWORD', "Invalid login credentials!");
define('STARTER_GREETING', "This page is restricted, please log in.");
define('USERNAME', "Username");
define('PASSWORD', "Password");
define('ENTER_USERNAME', "Enter Username");
define('ENTER_PASSWORD', "Enter Password");
define('REMEMBER_THIS_COMPUTER', "Remember this computer");
define('BUTTON_LOGIN', "Log in &rarr;");

// ================================================================================================
// ### DO NOT TOUCH ANYTHING BELOW THIS LINE ###
// ================================================================================================

class Login {
	// unique prefix that is used with this object (on cookies and password salt)
	var $prefix = "login_";
	// days "remember me" cookies will remain
	var $cookie_duration = 21;
	// temporary values for comparing login are auto set here. do not set your own $user or $pass here
	var $user = "";
	var $pass = "";

  function authorize() {
	//save cookie info to session
	if(isset($_COOKIE[$this->prefix.'user'])){
		$_SESSION[$this->prefix.'user'] = $_COOKIE[$this->prefix.'user'];
		$_SESSION[$this->prefix.'pass'] = $_COOKIE[$this->prefix.'pass'];
	}

	//if setting vars
	if(isset($_POST['action']) && $_POST['action'] == "set_login"){

		$this->user = $_POST['user'];
		$this->pass = md5($this->prefix.$_POST['pass']); //hash password. salt with prefix

		$this->check();//dies if incorrect

		//if "remember me" set cookie
		if(isset($_POST['remember'])){
			setcookie($this->prefix."user", $this->user, time()+($this->cookie_duration*86400));// (d*24h*60m*60s)
			setcookie($this->prefix."pass", $this->pass, time()+($this->cookie_duration*86400));// (d*24h*60m*60s)
		}

		//set session
		$_SESSION[$this->prefix.'user'] = $this->user;
		$_SESSION[$this->prefix.'pass'] = $this->pass;
	}

	//if forced log in
	elseif(isset($_GET['action']) && $_GET['action'] == "prompt"){
		session_unset();
		session_destroy();
		//destroy any existing cookie by setting time in past
		if(!empty($_COOKIE[$this->prefix.'user'])) setcookie($this->prefix."user", "blanked", time()-(3600*25));
		if(!empty($_COOKIE[$this->prefix.'pass'])) setcookie($this->prefix."pass", "blanked", time()-(3600*25));

		$this->prompt();
	}

	//if clearing the login
	elseif(isset($_GET['action']) && $_GET['action'] == "clear_login"){
		session_unset();
		session_destroy();
		//destroy any existing cookie by setting time in past
		if(!empty($_COOKIE[$this->prefix.'user'])) setcookie($this->prefix."user", "blanked", time()-(3600*25));
		if(!empty($_COOKIE[$this->prefix.'pass'])) setcookie($this->prefix."pass", "blanked", time()-(3600*25));

		$msg = '<span class="green">'.LOGOUT_COMPLETE.'</span>';
		$this->prompt($msg);
	}

	//prompt for
	elseif(!isset($_SESSION[$this->prefix.'pass']) || !isset($_SESSION[$this->prefix.'user'])){
		$this->prompt();
	}

	//check the pw
	else{
		$this->user = $_SESSION[$this->prefix.'user'];
		$this->pass = $_SESSION[$this->prefix.'pass'];
		$this->check();//dies if incorrect
	}

}

function check(){

	if(md5($this->prefix . LOGIN_PASS) != $this->pass || LOGIN_USER != $this->user){
		//destroy any existing cookie by setting time in past
		if(!empty($_COOKIE[$this->prefix.'user'])) setcookie($this->prefix."user", "blanked", time()-(3600*25));
		if(!empty($_COOKIE[$this->prefix.'pass'])) setcookie($this->prefix."pass", "blanked", time()-(3600*25));
		session_unset();
		session_destroy();

		$msg='<span class="red">'.INCORRECT_USERNAME_PASSWORD.'</span>';
		$this->prompt($msg);
	}
}

function prompt($msg=''){
?>
<html><head><title><?php echo STARTER_GREETING; ?></title>	<style>
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1.4em;vertical-align:top;height:1.1em}.pure-paginator .pure-button:focus,.pure-paginator .pure-button:active{outline-style:none}.pure-paginator .prev,.pure-paginator .next{color:#C0C1C3;text-shadow:0 -1px 0 rgba(0,0,0,.45)}.pure-paginator .prev{border-radius:2px 0 0 2px}.pure-paginator .next{border-radius:0 2px 2px 0}@media (max-width:480px){.pure-menu-horizontal{width:100%}.pure-menu-children li{display:block;border-bottom:1px solid #000}}.pure-table{border-collapse:collapse;border-spacing:0;empty-cells:show;border:1px solid #cbcbcb}.pure-table caption{color:#000;font:italic 85%/1 arial,sans-serif;padding:1em 0;text-align:center}.pure-table td,.pure-table th{border-left:1px solid #cbcbcb;border-width:0 0 0 1px;font-size:inherit;margin:0;overflow:visible;padding:.5em 1em}.pure-table td:first-child,.pure-table th:first-child{border-left-width:0}.pure-table thead{background:#e0e0e0;color:#000;text-align:left;vertical-align:bottom}.pure-table td{background-color:transparent}.pure-table-odd td{background-color:#f2f2f2}.pure-table-striped tr:nth-child(2n-1) td{background-color:#f2f2f2}.pure-table-bordered td{border-bottom:1px solid #cbcbcb}.pure-table-bordered tbody>tr:last-child td,.pure-table-horizontal tbody>tr:last-child td{border-bottom-width:0}.pure-table-horizontal td,.pure-table-horizontal th{border-width:0 0 1px;border-bottom:1px solid #cbcbcb}.pure-table-horizontal tbody>tr:last-child td{border-bottom-width:0}
.wrapper{padding:10px;}.highlight{padding:10px;}.center{margin:0 auto;max-width:300px;background:#f3f3f3;padding:10px;border:1px solid #ddd;}
.green{color:green;}.red{color:red;}
p.copyright{color:#999;}p.copyright a{text-decoration:none;color:#999;font-weight:bold;}
</style></head><body>
<div class="wrapper"><div class="highlight"><div class="center">
<form class="pure-form pure-form-stacked" action="<?php echo $_SERVER['SCRIPT_NAME']; ?>" method="post">
    <fieldset>
        <legend><?php if ($msg !== '') { echo $msg; } else { echo STARTER_GREETING; } ?></legend>
        <input type="hidden" name="action" value="set_login">
        <!-- <label for="username"><strong><?php echo USERNAME; ?>:</strong></label> -->
        <input id="username" type="text" name="user" placeholder="<?php echo ENTER_USERNAME; ?>" class="pure-input-1">
        <!-- <label for="password"><strong><?php echo PASSWORD; ?>:</strong></label> -->
        <input id="password" type="password" name="pass" placeholder="<?php echo ENTER_PASSWORD; ?>" class="pure-input-1">
        <label for="remember" class="pure-checkbox">
            <input id="remember" name="remember" type="checkbox"> <?php echo REMEMBER_THIS_COMPUTER; ?>
        </label>
        <button type="submit" class="pure-button pure-button-primary"><?php echo BUTTON_LOGIN; ?></button>
    </fieldset>
</form>
</div></div></div>
</body></html>

<?php exit;}} ?>