title: Apple Push Notification Limits
body: <p>I'm developing an iOS application that uses push notifications, I have implemented the app and the server side and it works great if I send just one or two notifications. The problem comes when I need to send the same notification to all of my users, the notifications only get to the first users of the loop.
  I'm in sandbox, so I wonder if there is any limit for sandbox environment, because I have read that the APNS service has no limit.
  Any idea?</p>
  
  <p>Thanks in advance,</p>
  
  <p><strong>UPDATED SOLUTION:</strong></p>
  
  <p>I had to check apple response, I was sending push to invalid tokens and Apple disconnected me from server. With the following function I have solved the problem.
  Thanks @Eran and <a href="http://learn-php-by-example.blogspot.com.es/2013/01/working-with-apple-push-notification.html" rel="noreferrer">this post</a></p>
  
  <pre><code>/* FUNCTION to check if there is an error response from Apple
   * Returns TRUE if there was and FALSE if there was not
   */
  public function checkAppleErrorResponse($fp) {
  
      //byte1=always 8, byte2=StatusCode, bytes3,4,5,6=identifier(rowID). 
      // Should return nothing if OK.
  
      //NOTE: Make sure you set stream_set_blocking($fp, 0) or else fread will pause your script and wait 
      // forever when there is no response to be sent. 
      $apple_error_response = fread($fp, 6);
      if ($apple_error_response) {
  
          // unpack the error response (first byte 'command" should always be 8)
          $error_response = unpack('Ccommand/Cstatus_code/Nidentifier', $apple_error_response); 
  
          if ($error_response['status_code'] == '0') {
          $error_response['status_code'] = '0-No errors encountered';
  
          } else if ($error_response['status_code'] == '1') {
          $error_response['status_code'] = '1-Processing error';
  
          } else if ($error_response['status_code'] == '2') {
          $error_response['status_code'] = '2-Missing device token';
  
          } else if ($error_response['status_code'] == '3') {
          $error_response['status_code'] = '3-Missing topic';
  
          } else if ($error_response['status_code'] == '4') {
          $error_response['status_code'] = '4-Missing payload';
  
          } else if ($error_response['status_code'] == '5') {
          $error_response['status_code'] = '5-Invalid token size';
  
          } else if ($error_response['status_code'] == '6') {
          $error_response['status_code'] = '6-Invalid topic size';
  
          } else if ($error_response['status_code'] == '7') {
          $error_response['status_code'] = '7-Invalid payload size';
  
          } else if ($error_response['status_code'] == '8') {
          $error_response['status_code'] = '8-Invalid token';
  
          } else if ($error_response['status_code'] == '255') {
          $error_response['status_code'] = '255-None (unknown)';
  
          } else {
          $error_response['status_code'] = $error_response['status_code'].'-Not listed';
  
          }
  
          echo '&lt;br&gt;&lt;b&gt;+ + + + + + ERROR&lt;/b&gt; Response Command:&lt;b&gt;' . $error_response['command'] . '&lt;/b&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Identifier:&lt;b&gt;' . $error_response['identifier'] . '&lt;/b&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Status:&lt;b&gt;' . $error_response['status_code'] . '&lt;/b&gt;&lt;br&gt;';
  
          echo 'Identifier is the rowID (index) in the database that caused the problem, and Apple will disconnect you from server. To continue sending Push Notifications, just start at the next rowID after this Identifier.&lt;br&gt;';
          return true;
      }
      return false;
  }
  </code></pre>