lychee/php/helpers/getGraphHeader.php

<?php

function getGraphHeader($photoID) {

	$photo = new Photo($photoID);
	if ($photo->getPublic('')===false) return false;

	$query	= Database::prepare(Database::get(), "SELECT title, description, url, medium FROM ? WHERE id = '?'", array(LYCHEE_TABLE_PHOTOS, $photoID));
	$result	= Database::get()->query($query);
	$row	= $result->fetch_object();

	if (!$result||!$row) return false;

	if ($row->medium==='1')	$dir = 'medium';
	else					$dir = 'big';

	$parseUrl	= parse_url('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
	$url		= $parseUrl['scheme'] . '://' . $parseUrl['host'] . $parseUrl['path'] . '?' . $parseUrl['query'];
	$picture	= $parseUrl['scheme'] . '://' . $parseUrl['host'] . $parseUrl['path'] . '/../uploads/' . $dir . '/' . $row->url;

	$url		= htmlentities($url);
	$picture	= htmlentities($picture);

	$row->title			= htmlentities($row->title);
	$row->description	= htmlentities($row->description);

	$return = '<!-- General Meta Data -->';
	$return .= '<meta name="title" content="' . $row->title . '">';
	$return .= '<meta name="description" content="' . $row->description . ' - via Lychee">';
	$return .= '<link rel="image_src" type="image/jpeg" href="' . $picture . '">';

	$return .= '<!-- Twitter Meta Data -->';
	$return .= '<meta name="twitter:card" content="photo">';
	$return .= '<meta name="twitter:title" content="' . $row->title . '">';
	$return .= '<meta name="twitter:image:src" content="' . $picture . '">';

	$return .= '<!-- Facebook Meta Data -->';
	$return .= '<meta property="og:title" content="' . $row->title . '">';
	$return .= '<meta property="og:description" content="' . $row->description . ' - via Lychee">';
	$return .= '<meta property="og:image" content="' . $picture . '">';
	$return .= '<meta property="og:url" content="' . $url . '">';

	return $return;

}

?>