Question

如何通过php流式传输文件？另外，我需要将一些标题传递给远程文件。

伪代码：

End user (download zip) <-> http://localhost/script.php?downloadId=1 <-> http://example.com/file.zip

带标题：

Cache-Control: No-Cache

我尝试了自己的解决方案，但它让nginx服务器抛出了

504 Gateway Time-out

这是代码：

<?php
    set_time_limit(0);

    define('CHUNK_SIZE', 1024*1024);

    $url = "http://example.com/file.zip";

    $opts = array(
        'http'=>array(
            'method'=>"GET",
            'header'=>"Accept-language: en\r\n" .
                "Cache-Control: No-Cache\r\n" .
                "Connection: Keep-Alive\r\n"
        )
    );
    $context = stream_context_create($opts);
    stream_context_set_default($opts);

    $fp = fopen($url, 'r', false, $context);
    foreach (get_headers($url) as $header)
    {
        header($header);
    }

    //fpassthru($fp);

    while (!feof($fp)) {
        $buffer = fread($fp, CHUNK_SIZE);
        echo $buffer;
        ob_flush();
        flush();

        if ($retbytes) {
            $cnt += strlen($buffer);
        }
    }

    $status = fclose($fp);

    if ($retbytes && $status) {
        return $cnt; // return num. bytes delivered like readfile() does.
    }

    exit;
?>

Answer 1

使用readfile()发送文件，header('Cache-Control: No-Cache')发送标题。

官方PHP文档中的示例：

$file = 'monkey.gif';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.basename($file).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    readfile($file);
    exit;
}

http://php.net/manual/de/function.readfile.php

有关更多替代方案，请查看Streaming a large file using PHP

通过带有标头的php流文件

1 个答案: