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<?php
$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $url);
// Only header
curl_setopt($curl, CURLOPT_NOBODY, true);
curl_setopt($curl, CURLOPT_HEADER, true);
// Do not print anything to output
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

// get last modified date
curl_setopt($curl, CURLOPT_FILETIME, true);

$result = curl_exec($curl);
// Get info
$info = curl_getinfo($curl);

echo "Last modified time : " . date ("d-m-Y H:i:s", $info['filetime']) );
?>