PHP with Mongo DB store & view Images

I successfully stored image files in MongoDB using PHP, when i retrieve images from Mongo db i had some problem, can anyone give the solution Here is my code:

<?php
$m = new Mongo(); 
$db = $m->selectDB("example"); 
$article = $db->articles;
$files = $article->find();
$gridFS = $db->getGridFS();
?>
<table>
<?php
    $i=1;
    foreach ($files as $storedfiles) {
    ?>
    <tr>
        <td width="30%"><strong><?php echo $i; ?></strong></td>
        <td width="70%">
            <?php //echo $storedfiles["_id"]; ?>
            <?php echo "Id :".$storedfiles["_id"]; ?>
            <?php echo "Title :".$storedfiles["title"]; ?>
            <?php echo "Keywords :".$storedfiles["keywords"]; ?>

            <?php echo "Image :".$storedfiles["image"]; ?>
            <?php   $image = $gridFS->findOne(array('_id' => new MongoId($storedfiles["image"]))); 
header('Content-type: image/jpg;');
            echo $image->getBytes();
    ?>


        </td>
    </tr>
    <?php
    $i++;
    }
    ?>
    </table>

Your example doesn't really make sense ("articles" isn't a GridFS collection, so its documents _ids probably wouldn't match GridFS files), but here's an example of inserting/getting back an image:

$m = new Mongo();
$db = $m->example;
$gridFS = $db->getGridFS();

$id = 123;

// store
$gridFS->storeFile("someFile.jpg", array("_id" => $id));

// retrieve
echo $gridFS->findOne(array("_id" => $id))->getBytes();

Try querying $db->fs->files to see what _ids you should be querying for.

Also, you can't create a MongoId from an arbitrary string. You can create one with a 24-digit hexidecimal string. Just use a different type for the _id field if you want something else (as above).