后端开发|php教程
php,图片
后端开发-php教程
直接看代码吧，很好明白的
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//用法 echo remote_filesize($url,$user=\,$pw=\);
$url = "/librarys/images/random/rand_11.jpg";//这里要换成你的图片地址
echo remote_filesize($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;
}
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。
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