I learned something new today

<?php
    if (isset($_POST["PHPSESSID"])) {
        session_id($_POST["PHPSESSID"]);
    }
    session_start();

    $conn = new Mongo("127.0.0.1:27017");         // Connect
    $db = $conn->uniform_server;                // Select DB
    $db->authenticate("user","password");        // Authenticate to MongoDB
    $grid = $db->getGridFS();                    // Initialize GridFS
    $name = $_FILES['Filedata']['name'];        // Get Uploaded file name
    $type = $_FILES['Filedata']['type'];        // Try to get file extension
    $id = $grid->storeUpload('Filedata',$name);    // Store uploaded file to GridFS
   
    /* Mime types did not work properly on my setup, hence the following logic */
    $ext = substr($name,-3);
    switch($ext) {
    case "jpg": $type = "image/jpeg"; break;
    case "gif": $type = "image/gif"; break;
    case "png": $type = "image/png"; break;
    case "txt": $type = "text/plain"; break;
    case "pdf": $type = "application/pdf"; break;
    case "zip": $type = "application/x-zip"; break;
    }
   
    /* Add additional metadata related to the file if required */
    $files = $db->fs->files;
    $files->update(array("filename" => $name), array('$set' => array("contentType" => $type, "aliases" => null, "metadata" => null)));

    $conn->close();                                // Close connection
   
    exit(0);
?>

<?php
    $conn = new Mongo("127.0.0.1:27017");         // Connect
    $db = $conn->uniform_server;                // Select DB
    $db->authenticate("user","password");        // Authenticate to MongoDB
    $grid = $db->getGridFS();                    // Initialize GridFS
     
    $cursor = $grid->find();

    foreach ($cursor as $obj) {                   // iterate through the results
        echo 'Filename: '.$obj->getFilename().' Size: '.$obj->getSize().'<br/>';
    }
     
    $conn->close();                                // Disconnect from Server
    exit(0);
?>

<?php
    $conn = new Mongo("127.0.0.1:27017");         // Connect
    $db = $conn->uniform_server;                // Select DB
    $db->authenticate("user","password");        // Authenticate to MongoDB
    $grid = $db->getGridFS();                    // Initialize GridFS
     
    $ask = $_REQUEST['file'];                   // Get filename requested
 
    $file = $grid->findOne(array('filename' => $ask));
    $files = $db->fs->files;
    $file1 = $files->findOne(array('filename' => $ask));
    $id = $file->file['_id'];
 
    if ( (substr($ask,-3) == 'zip') || (substr($ask,-3) == 'pdf') ) {
       /* Any file types you want to be downloaded can be listed in this */
       header('Content-Type: application/octet-stream');
       header('Content-Disposition: attachment; filename='.$ask);
       header('Content-Transfer-Encoding: binary');
       $cursor = $db->fs->chunks->find(array("files_id" => $id))->sort(array("n" => 1));
       foreach($cursor as $chunk) {
          echo $chunk['data']->bin;
       }
    }
    else {
       header('Content-Type: '.$file1["contentType"]);
       echo $file->getBytes();
    }   

    $conn->close();                                // Disconnect from Server
    exit(0);
?>

<?php
    $conn = new Mongo("127.0.0.1:27017");         // Connect
    $db = $conn->uniform_server;                // Select DB
    $db->authenticate("user","password");        // Authenticate to MongoDB
    $grid = $db->getGridFS();                    // Initialize GridFS
     
    $filename = $_REQUEST["file"];                // Get requested filename
 
    $file = $grid->findOne($filename);             // Find file in GridFS
    $id = $file->file['_id'];                    // Get the files ID
    $grid->delete($id);                            // Delete the file

    $conn->close();                                // Disconnect from Server
    exit(0);
?>