doupo1908 2018-05-23 04:57
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PHP echos文件作为文本而不是服务器上的二进制文件

I have written a PHP page which reads a file and does echo it after adding some headers:

header('Content-disposition: filename="' . $fname . '"');
header('Pragma: no-cache');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header("Content-type: $AttachFileType");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . filesize($ffullname));
echo file_get_contents($ffullname);

This piece of code does well on local test, but when porting to the server, the response is not as expected. For example when I want to retrieve a png file, I get the below image on local test:

local output

while server test outputs this one:

server output

As I have investigated, the only difference of them is 4 additional headers on server response. Local test response headers:

Cache-Control: must-revalidate, post-check=0, pre-check=0
Connection: Keep-Alive
Content-disposition: filename="attachment_hrmstotal_generalskills_6.png"
Content-Length: 2401
Content-Transfer-Encoding: binary
Content-Type: png
Date: Wed, 23 May 2018 04:45:02 GMT
Expires: 0
Keep-Alive: timeout=5, max=97
Pragma: public
Server: Apache/2.4.27 (Ubuntu)

and server response headers are these:

Cache-Control: must-revalidate, post-check=0, pre-check=0
Connection: keep-alive
Content-disposition: filename="attachment_hrmstotal_generalskills_1.png"
Content-Length: 184450
Content-Transfer-Encoding: binary
Content-Type: png
Date: Wed, 23 May 2018 04:40:56 GMT
Expires: 0
Pragma: public
Server: nginx/1.8.0
Strict-Transport-Security: max-age=31536000
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block

The last four headers is the difference. What is the problem, its reason and how to solve it?

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1条回答 默认 最新

  • douge7771 2018-05-27 18:02
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    Your content-type should be Content-type: image/png

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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