问PHP文档mLab

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Fatal error: Uncaught MongoDB\Driver\Exception\ConnectionTimeoutException:
No suitable servers found (`serverSelectionTryOnce` set): [connection timeout calling ismaster on 'ds157390.mlab.com:57390'] in C:\xampp\htdocs\MongoDB\vendor\mongodb\mongodb\src\Collection.php:726 
Stack trace: #0 C:\xampp\htdocs\MongoDB\vendor\mongodb\mongodb\src\Collection.php(726): MongoDB\Driver\Manager->selectServer(Object(MongoDB\Driver\ReadPreference)) 
#1 C:\xampp\htdocs\MongoDB\azureConnect.php(46): MongoDB\Collection->insertMany(Array) #2 {main} thrown in C:\xampp\htdocs\MongoDB\vendor\mongodb\mongodb\src\Collection.php on line 726

<?php

ini_set('max_execution_time', 0);

require 'vendor/autoload.php';

$seedData = array(
  array(
    'decade' => '1970s',
    'artist' => 'Debby Boone',
    'song' => 'You Light Up My Life',
    'weeksAtOne' => 10
),
array(
    'decade' => '1980s',
    'artist' => 'Olivia Newton-John',
    'song' => 'Physical',
    'weeksAtOne' => 10
),
array(
    'decade' => '1990s',
    'artist' => 'Mariah Carey',
    'song' => 'One Sweet Day',
    'weeksAtOne' => 16
),
 );

 $uname = "test";
 $pword = "test";
 $uri = "mongodb://".$uname.":".$pword."@ds157390.mlab.com:57390/data4estate";

 $conn = new MongoDB\Client($uri);

 $songs = $conn->data4estate->songs;

 $songs->insertMany($seedData);