<?phpclass MongoDB{  private $database;  private $mongo;  function __construct()   {    $this->mongo = new MongoClient("mongodb://user:password@server_address:port/admin");    $this->database = $this->mongo->selectDB("data");  }  {    return $this->database->selectCollection($collection);  }  //獲取所有的集合名  function getCollections()   {    return $this->database->getCollectionNames();  }  //選數據庫  function selectDB($db)  {    $this->database = $this->mongo->selectDB($db);  }}

class DemoController extends CI_Controller{  function __construct() {    parent::__construct();    //CI中加載類    $this->load->library('mongo_lib', '', 'mongodb');  }  //插入一條數據  function create()  {    $data = array('name'=>'mike','email'=>'abc@163.com);    //選擇庫，shell：user demo_db    $this->mongodb->selectDB('demo_db');    //選擇集合,db.demo_col.insert();    $rebateCollection = $this->mongodb->getCollection('demo_collection');    $res = $rebateCollection->insert($data);  }}