What to do if there is an error when downloading large files in PHP

Solution to the error when php downloads large files: 1. View the nginx log on the server; 2. View the fpm running identity; 3. Edit the nginx configuration to set the identity; 4. Pass "chown -R daemon / aichenk/soft/nginx/fastcgi_temp/" just change the path.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What should I do if there is an error when downloading a large file in php?

Remember a pitfall when PHP failed to download large files

Explanation

php provides file storage and downloading, nginx serves as the web server, and fpm does the parsing.

Phenomena

When downloading a 5M picture, it always prompts that the download failed, or the downloaded file is incomplete and only part of the image is displayed (different for each download)

phpDownload related code

$file = BASE_PATH . '/public/files/IMG_5727.jpg';
$size = filesize($file);
header( "Content-type: application/octet-stream" );
header("Accept-Ranges: bytes");
header("Accept-Length: {$size}");
header("Content-Disposition: attachment; filename=IMG_5727.jpg");
$fp = fopen($file, 'rb');
$readBuffer = 4096;
while (!feof($fp)) {
    echo fread($fp, $readBuffer);
}
fclose($fp);

Solution

After searching around, I went to the server to check the nginx log, and there was indeed an error message

2020/05/06 13:09:13 [crit] 1482#0: *23258 open() "/aichenk/soft/nginx/fastcgi_temp/4/17/0000000174" failed (13: Permis
sion denied) while reading upstream, client: 172.21.0.12, server: 192.168.5.5, request: "GET /temp/t2 HTTP/1.1", upstr
eam: "fastcgi://127.0.0.1:9001", host: "192.168.5.5:8080"

nginx shows permission problems, and finally unifies the nginx running identity and fpm

# fpm配置
[www]
user = daemon
group = daemon
 
# 查看到fpm运行身份为`daemon`,编辑nginx配置设置身份
 
# nginx配置
#user  nobody;
user daemon;

The previous path ownership user changed

chown -R daemon /aichenk/soft/nginx/fastcgi_temp/

Test passed

Explanation

Personal analysis: This error is actually reflected when the data is placed in the buffer. In theory, not only large files, but also data transmission volume exceeding a certain value will have this problem. Just pay attention when setting up the environment.

Recommended learning: "PHP Video Tutorial"

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