获取远程文件的最后修改日期

我想通过curl 获取远程文件的最后修改日期。有谁知道这是怎么做到的吗？

你可能可以使用这样做curl_getinfo() http://php.net/manual/en/function.curl-getinfo.php:

<?php
$curl = curl_init('http://www.example.com/filename.txt');

//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
}