find the last created image file with remote or external link - php

Question

HI guys i have some jpeg files with this format:
123-1.jpeg ,123-2.jpeg ,123-3.jpeg ,123-4.jpeg ....
This files located on my VPS and i need to find and show the lasted file by remote (my means external web link ).
i have problem how i can read files with such name format i tried this is not work:
$screnshot_url = "http://8.7.6.5/screenshots/123-*.jpeg ";
$filemtime = filemtime_remote($screnshot_url);
$files = $screnshot_url;
$files = array_combine($files, array_map($filemtime, $files));
arsort($files);
$img = key($files);
function filemtime_remote($uri)
{
$uri = parse_url($uri);
$handle = #fsockopen($uri['host'],80);
if(!$handle)
return 0;
fputs($handle,"GET $uri[path] HTTP/1.1\r\nHost: $uri[host]\r\n\r\n");
$result = 0;
while(!feof($handle))
{
$line = fgets($handle,1024);
if(!trim($line))
break;
$col = strpos($line,':');
if($col !== false)
{
$header = trim(substr($line,0,$col));
$value = trim(substr($line,$col+1));
if(strtolower($header) == 'last-modified')
{
$result = strtotime($value);
break;
}
}
}
fclose($handle);
return $result;
}