title: Firestore Client' not found
body: <p>I'm new to both PHP and Firebase. I tried to use firestore on a php site.  </p>
  
  <pre><code>use Google\Cloud\Firestore\FirestoreClient;
  
  ini_set("display_errors", 1);
  ini_set("track_errors", 1);
  ini_set("html_errors", 1);
  error_reporting(E_ALL);
  
  initialize();
  
  
  
  
  function initialize()
  {
      // Create the Cloud Firestore client
      $db = new FirestoreClient();
      printf('Created Cloud Firestore client with default project ID.' . PHP_EOL);
  }
  </code></pre>
  
  <p>but the there's a Fatal error: Class 'Google\Cloud\Firestore\FirestoreClient' not found in /var/www/html/test.php on line 37</p>
  
  <p>I followed quick start tutorial - <a href="https://firebase.google.com/docs/firestore/quickstart" rel="nofollow noreferrer">https://firebase.google.com/docs/firestore/quickstart</a></p>
  
  <p>I'm using debian 9 VPS with PHP 5.6</p>