title: MongoDB: Fatal error: Class 'MongoClient' not found
body: <p>When executing the following PHP code:</p>
  
  <pre><code>$m = new MongoClient("mongodb://localhost:27017");
  </code></pre>
  
  <p>I get the following error: </p>
  
  <blockquote>
    <p>Fatal error: Class 'MongoClient' not found in (...)</p>
  </blockquote>
  
  <p>MongoDB extension seems properly installed (I copied <code>php_mongodb.dll</code> to ext folder and updated <code>php.ini</code>).</p>
  
  <p>PHP seems to confirm that the extension is running properly as the following code confirms it is loaded: </p>
  
  <pre><code>echo extension_loaded("mongodb") ? "loaded\n" : "not loaded\n";
  </code></pre>
  
  <p>Also, <code>phpinfo()</code> shows that mongodb extension has been loaded.</p>
  
  <hr>
  
  <p><strong>UPDATE</strong>: my problem is still not solved.</p>
  
  <p><code>phpinfo()</code> clearly shows that the driver is loaded:</p>
  
  <p><a href="https://i.stack.imgur.com/ep76F.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ep76F.jpg" alt="enter image description here"></a></p>
  
  <p>But I am still receiving the same fatal error.</p>