Question

如果我转到http://site.com/uploads/file.pdf我可以检索文件。

但是，如果我有一个脚本，如：

<?php 

ini_set('display_errors',1);
error_reporting(E_ALL|E_STRICT);

//require global definitions 
require_once("includes/globals.php"); 
//validate the user before continuing 
isValidUser(); 
$subTitle = "Attachment";   
$attachmentPath = "/var/www/html/DEVELOPMENT/serviceNow/selfService/uploads/";
if(isset($_GET['id']) and !empty($_GET['id'])){
    //first lookup attachment meta information 
    $a = new Attachment(); 
    $attachment = $a->get($_GET['id']); 
    //filename will be original file name with user name.n prepended 
    $fileName = $attachmentPath.$_SESSION['nameN'].'-'.$attachment->file_name; 
    //instantiate new attachmentDownload and query for attachment chunks 
    $a = new AttachmentDownload(); 
    $chunks= $a->getRecords(array('sys_attachment'=>$_GET['id'], '__order_by'=>'position')); 


    $fh = fopen($fileName.'.gz','w');                                                      
    // read and base64 encode file contents 
    foreach($chunks as $chunk){
            fwrite($fh, base64_decode($chunk->data));   
    }
    fclose($fh);

    //open up filename for writing 
    $fh = fopen($fileName,'w');     
    //open up filename.gz for extraction                                
    $zd = gzopen($fileName.'.gz', "r");
    //iterate over file and write contents 
    while (!feof($zd)) {
            fwrite($fh, gzread($zd, 60*57));    
    }
    fclose($fh); 
    gzclose($zd);
    unlink($fileName.'.gz'); 
    $info = pathinfo($fileName); 

    header('Content-Description: File Transfer');
    header('Content-Type: '.Mimetypes::get($info['extension']));
    header('Content-Disposition: attachment; filename=' . basename($fileName));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($fileName));
    ob_clean();
    flush();
    readfile($fileName);
    exit();
}else{
    header("location: ".$links['status']."?".urlencode("item=incident&action=view&status=-1&place=".$links['home']));   
}


?>

这导致向我发送文件，但是当我打开它时，我收到一条错误说：

"File type plain text document (text/plain) is not supported"

Answer 1

首先，我首先检查HTTP标头。您可以使用“Live HTTP headers”扩展轻松地在Firefox中执行此操作;不确定其他浏览器中的等价物。这将让您验证标头是否实际设置为“application / pdf”以及您的其他标头是否也已设置。

如果没有设置任何标头，您可能会在调用header()之前无意中发送输出。 <?php标记之前是否有空格？

Answer 2

你确定application / pdf是浏览器实际看到的标题吗？

您可以使用各种HTTP开发工具进行检查，例如适用于Mac的HTTP Client或适用于Firefox的Firebug。

Answer 3

我使用这个并且它有效。

if(file_exists($file_serverfullpath))
{    
   header("Pragma: public");
   header("Expires: 0");
   header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
   header("Cache-Control: private", false);

   //sending download file
   header("Content-Type: application/octet-stream"); //application/octet-stream is more generic it works because in now days browsers are able to detect file anyway
   header("Content-Disposition: attachment; filename=\"" . basename($file_serverfullpath) . "\""); //ok
   header("Content-Transfer-Encoding: binary");
   header("Content-Length: " . filesize($file_serverfullpath)); //ok
   readfile($file_serverfullpath);
}

Answer 4

尝试预先添加“error_reporting（0）;”。我在http://php.net/readfile的评论中找到了这一点（你从这里得到了这个例子）。

另一个可能是问题的是文件大小。过去有一些关于PHP5的问题（我们在这里谈论2005年，所以我希望现在已经解决了这个问题）在阅读文件＆gt; 2MB时遇到问题。如果您的文件大小超过此值，您可能需要验证它是否读取整个文件。

通过php通过http为用户提供文件

4 个答案: