使用PHP流式传输大文件 [英] Streaming a large file using PHP

问题描述

我有一个200MB的文件，我想通过下载给用户。但是，由于我们希望用户只能下载一次文件，所以我们这样做：

I have a 200MB file that I want to give to a user via download. However, since we want the user to only download this file once, we are doing this:

echo file_get_contents('http://some.secret.location.com/secretfolder/the_file.tar.gz');

强制下载。但是，这意味着整个文件必须加载到内存中，这通常不起作用。我们如何将这个文件传送给他们，以每个块的几kb？

to force a download. However, this means that the whole file has to be loaded in memory, which usually doesn't work. How can we stream this file to them, at some kb per chunk?

推荐答案

尝试这样的东西（来源 http://teddy.fr/2007/11/28/how- serve-big-files-through-php / ）：

Try something like this (source http://teddy.fr/2007/11/28/how-serve-big-files-through-php/):

<?php
define('CHUNK_SIZE', 1024*1024); // Size (in bytes) of tiles chunk

// Read a file and display its content chunk by chunk
function readfile_chunked($filename, $retbytes = TRUE) {
    $buffer = '';
    $cnt    = 0;
    $handle = fopen($filename, 'rb');

    if ($handle === false) {
        return false;
    }

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

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

    $status = fclose($handle);

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

    return $status;
}

// Here goes your code for checking that the user is logged in
// ...
// ...

if ($logged_in) {
    $filename = 'path/to/your/file';
    $mimetype = 'mime/type';
    header('Content-Type: '.$mimetype );
    readfile_chunked($filename);

} else {
    echo 'Tabatha says you haven\'t paid.';
}
?>

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