How to Password Protect Specific Files on a Web Folder

<?php // RAY_force_download.php
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('log_errors',     TRUE);


// DEMONSTRATE HOW TO CAUSE A FILE DOWNLOAD


// REQUIRED FOR USE WITH THE PHP date() FUNCTIONS
date_default_timezone_set('America/New_York');

// A FILE TO DOWNLOAD - THIS LINK COULD COME IN THE URL VIA $_GET, OR COULD BE GENERATED INSIDE THE SCRIPT
$url = "http://www.LAPRBass.com/RAY_short_text_file.txt";

// THE USE CASE FOR THE FUNCTION
force_download($url);


// FUNCTION TO FORCE A DOWNLOAD FROM A FILE
function force_download($filename)
{
    // GET THE CONTENTS OF THE FILE
    $filedata = @file_get_contents($filename);

    // SUCCESS
    if ($filedata)
    {
        // GET A NAME FOR THE FILE
        $basename = basename($filename);

        // THESE HEADERS ARE USED ON ALL BROWSERS
        header("Content-Type: application-x/force-download");
        header("Content-Disposition: attachment; filename=$basename");
        header("Content-length: ".(string)(strlen($filedata)));
        header("Expires: ".gmdate("D, d M Y H:i:s", mktime(date("H")+2, date("i"), date("s"), date("m"), date("d"), date("Y")))." GMT");
        header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");

        // THIS HEADER MUST BE OMITTED FOR IE 6+
        if (FALSE === strpos($_SERVER["HTTP_USER_AGENT"], 'MSIE '))
        {
            header("Cache-Control: no-cache, must-revalidate");
        }

        // THIS IS THE LAST HEADER
        header("Pragma: no-cache");

        // FLUSH THE HEADERS TO THE BROWSER
        flush();

        // WRITE THE FILE
        echo $filedata;
    }

    // ERROR
    else
    {
        trigger_error("ERROR: UNABLE TO OPEN $filename", E_USER_ERROR);
    }
}

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