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Download File using PHP Code

26 Nov

This is my favorite download-script, it works with files bigger than 10 MB on Apache 1.3 (or higher). I added the cache control to open also text files and others (without saving). Use this example code to download files from a protected directory for example.

<?php

// place this code inside a php file and call it f.e. "download.php"
$path = $_SERVER['DOCUMENT_ROOT']."/path2file/"; // change the path to fit your websites document structure
$fullPath = $path.$_GET['download_file'];

if ($fd = fopen ($fullPath, "r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf"); // add here more headers for diff. extensions
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download
        break;
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    }
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    while(!feof($fd)) {
        $buffer = fread($fd, 2048);
        echo $buffer;
    }
}
fclose ($fd);
exit;
// example: place this kind of link into the document where the file download is offered:
// <a href="download.php?download_file=some_file.pdf">Download here</a>
?>

Updates:
Added an example how to use this script with the filename from a query string
Mved the disposition header into the switch because the attachment attribute is sometimes needed
Using the function pathinfo() to get the file information (extension) now
Added the function stringconv() to handle also extensions with caps.

Demo:
The demo page demonstrate the functions file upload / download and handle directories

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Posted by on November 26, 2009 in PHP

 

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