long polling in php

ctrl.php

Polling::forResult(function($options) {
    if ($options['key'] == 'value') {
        // end polling
        return true;
    } else {
        // continue polling
        return false;
    }
}, ['key' => 'value']);

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);
		}
	}
}