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MongoDB的與此URL提到的步驟安裝在linux CentOS的服務器（SSH）的MongoDB安裝
http://docs.mongodb.org/manual/tutorial/install-mongodb-on-red-hat/
使用命令開始的MongoDB服務器和狀態是確定。
sudo service mongod start
When connecting mongodb with PHP (Yii app), it shows error like this.
include(MongoClient.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory
PHP code
<?php
// connect to mongodb
$m = new MongoClient();
echo "Connection to database successfully";
// select a database
$db = $m->health;
echo "Database mydb selected";
$collection = $db->medical;
echo "Collection selected succsessfully";
?>