本文介绍了curl不返回内容长度头的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
尝试使用curl获取图片文件大小，但不返回内容长度标题：
Trying to get image file size using curl but content length header is not returned:
$url ="http://www.collegefashion.net/wp-content/plugins/feed-comments-number/image.php?1263";
$fp = curl_init();
curl_setopt($fp, CURLOPT_NOBODY, true);
curl_setopt($fp, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($fp, CURLOPT_FAILONERROR,1);
curl_setopt($fp, CURLOPT_REFERER,'');
curl_setopt($fp, CURLOPT_URL, $url);
curl_setopt($fp, CURLOPT_HEADER,1);
curl_setopt($fp, CURLOPT_USERAGENT,'Mozilla/5.0');
$body = curl_exec($fp);
var_dump（$ body）：
var_dump($body):
HTTP/1.1 200 OK
Date: Sun, 02 May 2010 02:50:20 GMT
Server: Apache/2.0.63 (CentOS)
X-Powered-By: W3 Total Cache/0.8.5.2
X-Pingback: http://www.collegefashion.net/xmlrpc.php
Cache-Control: no-cache, must-revalidate
Expires: Sat, 26 Jul 1997 05:00:00 GMT
Content-Type: image/png
它通过ssh工作：
curl -i http://www.collegefashion.net/wp-content/plugins/feed-comments-number/image.php?1263
HTTP/1.1 200 OK
Date: Sun, 02 May 2010 03:38:43 GMT
Server: Apache/2.0.63 (CentOS)
X-Powered-By: W3 Total Cache/0.8.5.2
X-Pingback: http://www.collegefashion.net/xmlrpc.php
Cache-Control: no-cache, must-revalidate
Expires: Sat, 26 Jul 1997 05:00:00 GMT
Content-Length: 347
Content-Type: image/png
推荐答案
CURLOPT_NOBODY发出HEAD请求，而使用-i的命令行是GET请求...
CURLOPT_NOBODY makes a HEAD request while your command line with -i is a GET request...
如果您在命令行版本中使用-I，它们会更加类似。
If you'd use -I with your command line version they would be more similar.
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