Simple interface for getting oembed data from supported (and unsupported) sites.

oembed.php

<?php

function oembed_get_data($video_url, array $params = array(), &$error = null)
{
	$html = @file_get_contents($video_url);
	
	if (!$html)
	{
		$error = 'Could not download video page';
		return false;
	}
	
	$links = oebmed_parse_links($html);
	
	foreach ($links as $link)
	{
		if (!isset($link['type']) || empty($link['href']))
			continue;
		
		$oembed_url = $link['href'];
		
		if (!empty($params))
			$oembed_url .= (strpos($oembed_url, '?') === false ? '?' : '&')
				. http_build_query($params);
		
		if ($link['type'] == 'application/xml+oembed' || $link['type'] == 'text/xml+oembed')
			return oembed_get_xml_data($link['href'], $error);
		
		if ($link['type'] == 'application/json+oembed')
			return oembed_get_json_data($link['href'], $error);
	}
	
	// fallback using embed.ly
	$params = array_merge($params, array('url' => $video_url, 'format' => 'json'));
	$embedly_uri = 'http://api.embed.ly/1/oembed?' . http_build_query($params);
	
	return oembed_get_json_data($embedly_uri, $error);
}

function oebmed_parse_links($html)
{
	$links = array();
	
	if (preg_match_all('{<link ([^<>]+)/?>}i', $html, $matches))
		foreach ($matches[1] as $attributes_str)
		{
			preg_match_all('{([a-z]+)=(["\'])(.+?)\2}i', $attributes_str, $amatches, PREG_SET_ORDER);
		
			$attributes = array();
			foreach ($amatches as $amatch)
				$attributes[$amatch[1]] = html_entity_decode($amatch[3]);
		
			$links[] = $attributes;
		}
	
	return $links;
}

function oembed_get_xml_data($oembed_url, &$error = null)
{
	$xml = @simplexml_load_file($oembed_url);
	
	if (!$xml)
	{
		$error = 'Could not parse or load oembed xml data';
		return false;
	}
	
	$data = new stdClass;
	
	foreach ($xml as $property => $value)
		$data->$property = (string) $value;
	
	return $data;
}

function oembed_get_json_data($oembed_url, &$error = null)
{
	$json = @file_get_contents($oembed_url);
	
	if (!$json)
	{
		$error = 'Could not download oembed json data';
		return false;
	}
	
	$data = @json_decode($json);
	
	if (!$data)
	{
		$error = 'Could not parse oembed json data';
		return false;
	}
	
	return (object) $data;
}

?>