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直接看代码吧，很好明白的
代码如下://用法 echo remote_filesize($url,$user='',$pw='');
$url = "http://www.aa.com/librarys/images/random/rand_11.jpg";//这里要换成你的图片地址
echo remote_filesize($url,$pw='');
function remote_filesize($uri,$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';
}
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。 （编辑：安卓应用网）
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