Operate MongoDB database GridFS under PHP to store files

<?php //Initialize gridfs $conn = new Mongo(); //Connect to MongoDB $db = $conn->photos; //select database $grid = $db->getGridFS(); // get gridfs object $grid = $db->getGridFS(‘file’); //Get the file gridfs object //gridfs has three ways to store files //The first type of direct storage file $id = $grid->storeFile(“./logo.png”); $id = $grid->put(‘./logo.png’, array(‘ower’=>’myname’)); //storeFile has the same effect as put, followed by additional parameters, which are saved in the files file //The second storage file binary stream $data = get_file_contents(“./logo.png”); $id = $grid->storeBytes($data,array(“parame”=>’Additional parameters will be stored with the picture’)); //The third way to save the file $_FILES submitted directly by the form $id = $grid->storeUpload(‘upfile’); // equivalent to $id = $grid->storeFile($_FILES[‘upfile’][‘tmp_name’]); //————–The above is to save the picture–begin to read the picture below—————- //Return $id = md5 string after saving successfully $logo = $grid->findOne(array(‘_id’=>$id)); //Use _id as the index to get the file, or directly file name header(‘Content-type: image/png’); // output image header echo $logo ->getBytes(); // output data stream $grid->remove() delete file $grid->delete() also deletes files, but only the _id of the file can be passed $grid->drop() clears all data $grid->find() and findOne() directly search for files and return IDs, find() does not add parameters, and directly returns all file…