在php下载后从服务器中删除文件

$fullPath = 'folder_name/download.txt';

if ($fd = fopen ($fullPath,"r")) {
    $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);

    header("Content-type: application/octet-stream");
    header("Content-disposition: filename=\"".$path_parts["basename"]."\"");
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    $fd = fopen ($fullPath,"r");
    while(!feof($fd)) {
        $buffer = fread($fd,2048);
        echo $buffer;
    }
    fclose ($fd);

}

unlink($fullPath);

您可以在下载后的代码中看到我取消链接文件.但是如果我这样做损坏文件正在下载.因为有一段时间,文件在被完全下载之前被删除.有没有在PHP知道客户端下载文件成功,那么我可以删除吗？任何想法都将非常感激.