PHP implementation Gridfs storage files to MongoDB tutorial

Generally take the first method, directly transfer files, the second method suitable for the generation of data not saved to the local upload but directly to the binary system to MongoDB, the third way is to directly upload the form of the file into the MongoDB.

Initialize Gridfs
$conn = new Mongo (); Connect MongoDB
$db = $conn->photos; Select Database
$grid = $db->getgridfs (); Get Gridfs Object

Gridfs has three ways of storing files
The first type of direct storage file
$id = $grid->storefile ("./logo.png");

Second storage file binary stream
$data = Get_file_contents ("./logo.png");
$id = $grid->storebytes ($data, Array ("Parame" => ' additional parameters will be deposited with the picture '));

The third type of file to save direct form submissions $_files
$id = $grid->storeupload (' upfile ');
Equivalent
$id = $grid->storefile ($_files[' upfile '] [' tmp_name ']);

--------------above is to save the picture--start reading the picture below----------------

Returns $ID = MD5 string after successful save
$logo = $grid->findone (Array (' _id ' => $id)); Take _id as index to get files
Header (' content-type:image/png '); Output Picture Header
echo $logo->getbytes (); Output data stream

This feeling is the file stream form saved to the database, let small set feel that is the picture file saved to the database the same truth.