mongodb: Remote server has closed the connection

 <?php
 function getMongoClient($seeds = "", $options = array(), $retry = 3) {
     try {
         return new MongoClient($seeds, $options);
     } catch(Exception $e) {
         /* Log the exception so we can look into why mongod failed later */
         logException($e);
     }
     if ($retry > 0) {
         return getMongoClient($seeds, $options, --$retry);
     }
     throw new Exception("I've tried several times getting MongoClient.. Is mongod really running?");
 }
 
 try {
     $mc = getMongoClient("localhost", array());
 } catch(Exception $e) {
     /* Can't connect to MongoDB! */
     logException($e);
     die("Can't do anything :(");
 }

解决方法；失败重试