You are passing $header to curl_getinfo()
. It should be $curl
(the curl handle). You can get just the filetime
by passing CURLINFO_FILETIME
as the second parameter to curl_getinfo()
. (Often the filetime
is unavailable, in which case it will be reported as -1).
Your class seems to be wasteful, though, throwing away a lot of information that could be useful. Here’s another way it might be done:
class URIInfo
{
public $info;
public $header;
private $url;
public function __construct($url)
{
$this->url = $url;
$this->setData();
}
public function setData()
{
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $this->url);
curl_setopt($curl, CURLOPT_FILETIME, true);
curl_setopt($curl, CURLOPT_NOBODY, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HEADER, true);
$this->header = curl_exec($curl);
$this->info = curl_getinfo($curl);
curl_close($curl);
}
public function getFiletime()
{
return $this->info['filetime'];
}
// Other functions can be added to retrieve other information.
}
$uri_info = new URIInfo('http://www.codinghorror.com/blog/');
$filetime = $uri_info->getFiletime();
if ($filetime != -1) {
echo date('Y-m-d H:i:s', $filetime);
} else {
echo 'filetime not available';
}
Yes, the load will be lighter on the server, since it’s only returning only the HTTP header (responding, after all, to a HEAD
request). How much lighter will vary greatly.