Basic HTTP Authentication with PHP

HTTP authentication protection that can be used to restrict access to a page. This causes the browser to show a pop up message box to enter username and password. Below is a sample code for HTTP authentication:

<?php

if(!defined('PHP_AUTH_USER')){
    define('PHP_AUTH_USER','root');
}

if(!defined('')){
    define('PHP_AUTH_PW','toor');
}

if (!isset($_SERVER['PHP_AUTH_USER'])) {

    header('WWW-Authenticate: Basic realm="Restricted Area"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'You are not authorized to access this page.';
    exit;

} else {

    if( $_SERVER['PHP_AUTH_USER']==PHP_AUTH_USER &&
         $_SERVER['PHP_AUTH_PW']==PHP_AUTH_PW){

                //do your operation here.
    }else{
               header('WWW-Authenticate: Basic realm="Authorization"');
               header('HTTP/1.0 401 Unauthorized');
               echo 'You are entered wrong username/password.';
               exit;

    }

}?>

You can modify the above script as per your need. You can even integrate this to a database to compare username and password values with the username and password values stored in database.