<?php
try{
$mongo = new Mongo(); //create a connection to MongoDB
$databases = $mongo->listDBs(); //List all databases
echo '<pre>';
print_r($databases);
$mongo->close();
} catch(MongoConnectionException $e) {
//handle connection error
die($e->getMessage());
}
?>
    如果是连接时用不同的端口,构造函数中用:
$mongo = new Mongo($server="mongodb://localhost:8888");
  也可以指定timeout的策略;
  try {
$mongo = new Mongo($options=array('timeout'=> 100))
} catch(MongoConnectionException $e) {
die("Failed to connect to database ".$e->getMessage());
}

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