/**
* Test a URL for validity.
*
* @uses OpenGraphProtocol::is_valid_url if OpenGraphProtocol::VERIFY_URLS is true
* @param string $url absolute URL addressable from the public web
* @return bool true if URL is non-empty string. if VERIFY_URLS set then URL must also properly respond to a HTTP request.
*/
public static function is_valid_url($url)
{
if (is_string($url) && !empty($url)) {
if (OpenGraphProtocol::VERIFY_URLS) {
$url = OpenGraphProtocol::is_valid_url($url, array('text/html', 'application/xhtml+xml'));
if (!empty($url)) {
return true;
}
} else {
return true;
}
}
return false;
}
/**
* Set the secure URL for display in a HTTPS page
*
* @param string $url resource location
*/
public function setSecureURL($url)
{
if (is_string($url) && !empty($url)) {
$url = trim($url);
if (OpenGraphProtocol::VERIFY_URLS) {
if (parse_url($url, PHP_URL_SCHEME) === 'https') {
$url = OpenGraphProtocol::is_valid_url($url, array('text/html', 'application/xhtml+xml'));
} else {
$url = '';
}
}
if (!empty($url)) {
$this->secure_url = $url;
}
}
return $this;
}
