在PHP中读取/下载大文件而不会耗尽内存

Question

如何在不进入allowed memory bytes exhausted的情况下在PHP中读取/下载大型文件？

我正在尝试：

$content = null;
while (!feof($file['data'])) {
    $content .= fread($file['data'], 8192);
}

header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=\"" . $file['real_filename'] . "\"");
header("Content-Length: " . $file['length']);

echo $content;

Answer 1

你试过这个吗？

header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=\"" . $file['real_filename'] . "\"");
header("Content-Length: " . $file['length']);

while (!feof($file['data'])) {
    print fread($file['data'], 8192);
}