php 文件大小不适用于 URL(CDN URL)

Question

我正在尝试使用 this answer 获取文件的文件大小

这是我的PHP代码

<?php
echo filesize('LICENSE.txt');
echo filesize('http://cdn.bloody-disgusting.com/wp-content/uploads/2013/10/Victoria-Justice-HD-Wallpapers.jpg');
?>

以上代码仅适用于本地文件，但当我尝试获取 CDN URL 的文件大小时，出现错误

Warning: filesize() [function.filesize]: stat failed for http://cdn.bloody-disgusting.com/wp-content/uploads/2013/10/Victoria-Justice-HD-Wallpapers.jpg in test_db_operation() (line 80 of myphp.php).

基于 filesize php 手册 here

Description ¶

int filesize ( string $filename )
Gets the size for the given file.

Parameters ¶

**filename
Path to the file.

**Return Values ¶

Returns the size of the file in bytes, or FALSE (and generates an error of level E_WARNING) in case of an error.

filesize 是否不能与 URL 一起使用，或者我在这里做错了什么。请帮忙 !!!谢谢

Answer 1

有一些方法可以获取远程文件大小

1:get_headers

print_r(get_headers('http://cdn.bloody-disgusting.com/wp-content/uploads/2013/10/Victoria-Justice-HD-Wallpapers.jpg',true)); 

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($user) && !empty($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();    

   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;    
}   

3:套接字

function getFileSize($url)    
 {    
    $url = parse_url($url);    
    if($fp = @fsockopen($url['host'],empty($url['port'])?80:$url['port'],$error))    
   {    
       fputs($fp,"GET ".(empty($url['path'])?'/':$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;    
    }    
  }  

4:file_get_contents

$fCont = file_get_contents('http://cdn.bloody-disgusting.com/wp-content/uploads/2013/10/Victoria-Justice-HD-Wallpapers.jpg');    
 echo strlen($fCont)/1024;