Get the last modified date of a remote file

You could probably do something like this using curl_getinfo():

$curl = curl_init('');

//don't fetch the actual page, you only want headers
curl_setopt($curl, CURLOPT_NOBODY, true);

//stop it from outputting stuff to stdout
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

// attempt to retrieve the modification date
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) { //otherwise unknown
    echo date("Y-m-d H:i:s", $timestamp); //etc

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