API для своего сайта на PHP

header('Access-Control-Allow-Origin: *');

function danfaProcess() {
	var danfa = {
		'id'    : danfaId,
		'limit' : danfaLimit,
		'pose'  : danfaPose,
		'style' : (typeof danfaStyle !== 'undefined') ? danfaStyle : true,
		'url'   : escape(window.location.href),
		'width' : document.getElementById('danfa').offsetWidth
	};
	danfa = JSON.stringify(danfa);

	var XHR = ('onload' in new XMLHttpRequest()) ? XMLHttpRequest : XDomainRequest;
	var danfaXHR = new XHR();
	danfaXHR.open('GET', 'https://danfa.net/block.php?ad=' + danfa, true);
	danfaXHR.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=utf-8');
	danfaXHR.send();
	danfaXHR.onreadystatechange = function() {
		if (this.readyState != 4) {
			return false;
		};

		if (this.status != 200) {
			return false;
		};

		document.getElementById('danfa').innerHTML = this.responseText;
	};
};
danfaProcess();

if (typeof danfaReboot !== 'undefined' && danfaReboot != false) {
	setInterval(danfaProcess, 300000);
};

<!-- Danfa.Net -->
<div id="danfa">
<script type="text/javascript">
	var danfaId    = 1; // Identifier
	var danfaLimit = 3; // Max 4
	var danfaPose  = 'horizontal'; // 'horizontal' | 'vertical'
</script>
<script type="text/javascript" src="//danfa.net/file/js/ad.js"></script>
<!-- Danfa.Net End -->

<?php
header('Access-Control-Allow-Origin: *');

error_reporting(0); // Отключение вывода ошибок

require_once('include/define.php');
require_once('include/library/reqvest' . PHP);

if (!$ad = reqvest::get('get', 'ad'))
{
	exit;
}

$ad = json_decode($ad, true);
if (empty($ad['id']) | empty($ad['limit']) | !is_numeric($ad['id']) | !is_numeric($ad['limit']))
{
	exit;
}

$id    = $ad['id'];
$limit = ($ad['limit'] > 4) ? 4 : $ad['limit'];
$count = 0;

require_once('include/library/device' . PHP);
require_once('include/library/db' . PHP);

// Вычисление: сколько объявлений подать (определяется по ширине блока)
if ($limit != 1 && $ad['pose'] == 'horizontal' && isset($ad['width']) && $ad['width'] <= 750)
{
	if ($ad['width'] <= 750 && $ad['width'] > 600 && $limit == 4)
	{
		$limit = 3;
	}
	else if ($ad['width'] <= 600 && $ad['width'] > 450 && $limit > 2)
	{
		$limit = 2;
	}
	else if ($ad['width'] < 450)
	{
		$limit = 1;
	}
} // Вычисление: сколько объявлений подать (определяется по ширине блока) End

$q = 'SELECT site_id, url, status
    FROM sites
	WHERE site_id = ' . (int) $id;
$row = db::associative($q);
if (empty($row['site_id']) | parse_url($ad['url'], PHP_URL_HOST) != $row['url'] | $row['status'] != 1)
{
	exit;
}

$q = 'SELECT ad_id, site, link, name, description, img
    FROM ads
	WHERE site NOT IN (' . (int) $id . ')
	    AND status = 1
			AND activity = 1
				AND site IN (SELECT site_id FROM sites WHERE activity = 1 AND status = 1 AND account > 0)
					AND owner IN (SELECT user_id FROM users WHERE status = 1)
	ORDER BY RAND()
	LIMIT ' . (int) $limit;

if (db::quantity($q))
{
	$val = db::inquiry($q);
	$data = array();
	$ad_ids = '';
	while ($line = db::fetchArray($val))
	{
	    $ad_ids .= $line['ad_id'] . ', ';

		$data[] = $line;
		$count++;
	}

	$ad_ids = substr($ad_ids, 0, -2);

	$q = 'UPDATE ads
		SET
	        review = review + 1
		WHERE ad_id IN (' . $ad_ids . ')';
	db::inquiry($q);
}

$service = device::param('site.url');

$block  = '<div class="danfa_block">';
$block .= '	<div class="danfa_ad">';
$block .= '		<a href="' . $service . '" class="danfa_service" title:"' . device::lang('core.site_name') . '" target="_blank">' . device::lang('core.icon') . '</a>';
$block .= '	</div>';
$block .= '	<table class="danfa_table">';
if ($count)
{
	if ($ad['pose'] == 'horizontal' && $count == 2)
	{
		$style_td = ' style="width: 50%;"';
	}
	else if ($ad['pose'] == 'horizontal' && $count == 3)
	{
		$style_td = ' style="width: 33%;"';
	}
	else if ($ad['pose'] == 'horizontal' && $count == 4)
	{
		$style_td = ' style="width: 25%;"';
	}
	else
	{
		$style_td = ' style="width: 100%;"';
	}

	$block .= ($ad['pose'] == 'horizontal') ? '		<tr>' : null;
	foreach ($data as $line)
	{
		$link  = $service . '/url.php?link=' . base64_encode($id . '::' . $line['ad_id'] . '::' . $line['site'] . '::' . $line['link']);

		$anchor      = (mb_strlen($line['name']) > 50) ? mb_substr($line['name'], 0, 46) . ' ...' : $line['name'];
		$description = (mb_strlen($line['description']) > 100) ? mb_substr($line['description'], 0, 96) . ' ...' : $line['description'];
		$url         = parse_url($line['link'], PHP_URL_HOST);

		$block .= ($ad['pose'] == 'vertical') ? '		<tr>' : null;
		$block .= '			<td class="danfa_td"' . $style_td . '>';
		$block .= '				<a href="' . $link . '" class="danfa_link" title:"' . $line['name'] . '" target="_blank">' . $anchor . '</a>';
		$block .= '				<div>';
		$block .= (!empty($line['img'])) ? '					<img src="' . $service . '/' . URL_AD_IMG . $line['img'] . '" alt="' . $line['name'] . '" class="danfa_img" />' : null;
		$block .= '					<div class="danfa_div">' . $description . '</div>';
		$block .= '					<a href="' . $link . '" class="danfa_a" title:"' . $url . '" target="_blank">' . $url . '</a>';
		$block .= '				</div>';
		$block .= '			</td>';
		$block .= ($ad['pose'] == 'vertical') ? '		</tr>' : null;
	}
	$block .= ($ad['pose'] == 'horizontal') ? '		</tr>' : null;
}
$block .= '	</table>';
$block .= '</div>';
if ($ad['style'])
{
	$block .= '<link rel="stylesheet" type="text/css" href="' . $service . '/file/css/default.css">';
}

echo $block;