Long polling class

example1.php

public function get_check($queue_id = 0)
  {
		$options = array(
			'queue_id' => $queue_id
		);

		$status = Polling::forResult(function($options) {
			$queue = Queue::find($options['queue_id']);
			has_access($queue);

			if ($queue->status == 'completed')
				return true;

			return false;
		}, $options, 1000, 4);

		$data = array(
			'status' => $status
		);

		return json($data);
	}

example2.php

public function get_waiting()
  {
		$contact = Polling::forResult(function(){
			$contact = Contact::where_account_user_id(Auth::user()->account_user_id)
				->where_request(1)
				->first();

			if ($contact != null) {
				return $contact->to_array();
			}

			return false;
		});

		return json($contact);
	}

polling.php

<?php

class Polling
{
  public static function forResult($callback, $options = array(), $max_cycles = 35, $sleep = 2, $failed = false)
	{
		$thread = uniqid();
		$cycles = 0;

		while (1) {
			++$cycles;

			$result = $callback($options);
			if ($result !== false)
				return $result;

			if ($cycles >= $max_cycles)
				return $failed;

			sleep($sleep);
		}
	}
}