如何根据URL检查文件创建日期

Yes可以使用CURL curl_getinfo获取文件信息，而无需返回全身

示例

$curl = curl_init('URL_TO_XML');
curl_setopt($curl, CURLOPT_NOBODY, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_FILETIME, true);
$result = curl_exec($curl);
if ($result === false) {
    die (curl_error($curl)); 
}
$timestamp = curl_getinfo($curl, CURLINFO_FILETIME);
if ($timestamp != -1) { 
    echo date("Y-m-d H:i:s", $timestamp);
} 

NO
因为它是一个web url，您可能无法获得web服务器公开的更多信息

你可以这样做

Uri myUri = new Uri(url);
// Creates an HttpWebRequest for the specified URL. 
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(myUri); 
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
DateTime today = DateTime.Now;
// Uses the LastModified property to compare with today's date.
if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 0)
    Console.WriteLine("'nThe requested URI entity was modified today");
else
    if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 1)
        Console.WriteLine("'nThe requested URI was last modified on:{0}",
                        myHttpWebResponse.LastModified);
    // Releases the resources of the response.
myHttpWebResponse.Close(); 

是，如果您有权访问该文件，则可以使用urllib2。

对于蟒蛇2.7，试试这个：

req = urllib2.build_opener()
req.addheaders = [('User-Agent')]
#for full detail use this: 
    meta = req.open(link).info()
meta =req.open(link).info().getheader("Last-Modified")