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874天前//用法 echo remote_filesize($url,$user='',$pw=''); |
$url = "http://www.nowamagic.net/librarys/images/random/rand_11.jpg"; |
echo remote_filesize($url,$user='',$pw=''); |
function remote_filesize($uri,$user='',$pw='') |
{ |
// start output buffering |
ob_start(); |
// initialize curl with given uri |
$ch = curl_init($uri); // make sure we get the header |
curl_setopt($ch, CURLOPT_HEADER, 1); // make it a http HEAD request |
curl_setopt($ch, CURLOPT_NOBODY, 1); // if auth is needed, do it here |
if (!empty($user) && !empty($pw)) |
{ |
$headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw)); |
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); |
} |
$okay = curl_exec($ch); |
curl_close($ch); // get the output buffer |
$head = ob_get_contents(); // clean the output buffer and return to previous // buffer settings |
ob_end_clean(); // gets you the numeric value from the Content-Length // field in the http header |
$regex = '/Content-Length:\s([0-9].+?)\s/'; |
$count = preg_match($regex, $head, $matches); // if there was a Content-Length field, its value // will now be in $matches[1] |
if (isset($matches[1])) |
{ |
$size = $matches[1]; |
} |
else |
{ |
$size = 'unknown'; |
} |
$last_mb = round($size/(1024*1024),3); |
$last_kb = round($size/1024,3); |
return $last_kb . 'KB / ' . $last_mb.' MB'; |
} |
