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来源URL: http://blog.csdn.net/xuxujian/article/details/7237006
获取本地文件大小filesize()就可以了,但是如何获取远程文件的大小呢? 这里介绍三个方法来获取远程文件的大小.
获取本地文件大小filesize()就可以了,但是如何获取远程文件的大小呢? 这里介绍三个方法来获取远程文件的大小.
方法1:get_headers
- <?php
- get_headers($url,true);
- //返回结果
- Array
- (
- [0] => HTTP/1.1 200 OK
- [Date] => Sat, 29 May 2004 12:28:14 GMT
- [Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
- [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
- [ETag] => "3f80f-1b6-3e1cb03b"
- [Accept-Ranges] => bytes
- [Content-Length] => 438
- [Connection] => close
- [Content-Type] => text/html
- )
- ?>
此处可以直接根据Content-Length来获取到远程文件的大小了.
方法2:curl
- function remote_filesize($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 (!emptyempty($user) && !emptyempty($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
- $head = ob_get_contents();
- // clean the output buffer and return to previous
- // buffer settings
- ob_end_clean();
- echo '<br>head-->'.$head.'<----end <br>';
- // 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=round($size/(1024*1024),3);
- //return $last.' MB';
- return $size;
- }
方法3:socket
- function getFileSize($url)
- {
- $url = parse_url($url);
- if($fp = @fsockopen($url['host'],emptyempty($url['port'])?80:$url['port'],$error))
- {
- fputs($fp,"GET ".(emptyempty($url['path'])?'/':$url['path'])." HTTP/1.1\r\n");
- fputs($fp,"Host:$url[host]\r\n\r\n");
- while(!feof($fp))
- {
- $tmp = fgets($fp);
- if(trim($tmp) == '')
- {
- break;
- }
- elseif(preg_match('/Content-Length:(.*)/si',$tmp,$arr))
- {
- return trim($arr[1]);
- }
- }
- return null;
- }
- else
- {
- return null;
- }
- }
方法4:file_get_contents
- $fCont = file_get_contents("http://www.mg27.com/1.html");
- echo strlen($fCont)/1024;
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