获取远程图片的大小。

来自：http://www.nowamagic.net/librarys/veda/detail/2487有时候，我们需要知道远程图片的体积大小，那么PHP如何可以做到呢？这里介绍一个函数，先来看看演示：

//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 初始化一个cURL会话
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';
}

程序运行结果：

31.495KB / 0.031 MB

函数的思路是，先CURL获取图片到缓冲区，然后正则获取图片的Content-Length信息就OK了。