curl 的远程文件大小

Posted 2023-03-07

【中文标题】curl 的远程文件大小

【英文标题】：Remote file size with curl

【发布时间】：2012-01-30 13:37:59

【问题描述】：

问题检查远程网址的文件大小

以下内容的本质是一个链接，我们可以在该链接上获得另一个文件链接

让我们说... http://poiskm.ru/index.php/get/strack/679ca5/2dc1d0/f?download.mp3

--

http://musicbox.uz/download.php?file=http://poiskm.ru/index.php/get/strack/679ca5/2dc1d0/f?download.mp3

帮帮我！！

代码：

$file=$_GET['file'];

$ch = curl_init($file);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); //not necessary unless the file redirects (like the PHP example we're using here)
$data = curl_exec($ch);
curl_close($ch);
if ($data === false) 
$contentLength = '0';

if (preg_match('/Content-Length: (\d+)/', $data, $matches)) 
  $contentLength = (int)$matches[1];


$url = $file;
$file_name = basename($url); 


//lets be nice to the user and replace the spaces with happy things
$file_name=str_replace("%20","_",$file_name);

//this is the filename we get to play with
$infile = $url;
$file_name = stristr ($infile,basename ($infile));


header( "Pragma: public" ); // required
header( "Expires: 0" );
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public"); // required for certain browsers 
header("Content-Type: application/mp3");
header('Content-Disposition: attachment; filename="[www.MusicBox.uz]'.urldecode($file_name).'"');
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$contentLength);
//header('Connection: close');
// The File source is in .mp3 originally
//This is the file that we are downloading
readfile(stripslashes($file));

【问题讨论】：

相关：How to get the file size of a remotely stored image? (php)

【参考方案1】：

Google 上的第一个结果，http://www.php.net/manual/en/function.filesize.php#92462。 SOF 不能替代 Google。

这仅在远程主机提供有效的内容标头时才有效，即Content-Length。如果不先实际下载文件，您将无法获取文件大小。

<?php
$remoteFile = 'http://us.php.net/get/php-5.2.10.tar.bz2/from/this/mirror';
$ch = curl_init($remoteFile);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); //not necessary unless the file redirects (like the PHP example we're using here)
$data = curl_exec($ch);
curl_close($ch);
if ($data === false) 
  echo 'cURL failed';
  exit;


$contentLength = 'unknown';
$status = 'unknown';
if (preg_match('/^HTTP\/1\.[01] (\d\d\d)/', $data, $matches)) 
  $status = (int)$matches[1];

if (preg_match('/Content-Length: (\d+)/', $data, $matches)) 
  $contentLength = (int)$matches[1];


echo 'HTTP Status: ' . $status . "\n";
echo 'Content-Length: ' . $contentLength;
?>

【讨论】：

嗨，伙计，poiskm.ru/index.php/get/strack/679ca5/2dc1d0/f?download.mp3 url 状态 302 重定向。内容长度不起作用。

musicbox.uz/size.php HTTP 状态：302 内容长度：未知 poiskm.ru/index.php/get/strack/679ca5/2dc1d0/f?download.mp3 检查。

再次。我已经回答了你的问题。引用：This will only work if the remote host is supplying valid content header, namely Content-Length. You cannot otherwise get file size without actually downloading it first..