PHP-FTP流需要的建筑建议

Question

I've built an application which interacts with a web camera via FTP, however upon completing it I have a speed issue. The application structure is as follows:

Web Camera -> Proftp/Mysql -> PHP

The web camera ftp's images to the Proftp server which is managed via MySQL / PHP. The PHP acts as a client for users, and it in turn pulls the latest images from the FTP server.

This works, but is really slow. The problem is on the Proftp -> PHP side. Using the standard PHP ftp library it takes around 4 seconds to connect to the ftp server -> do a directory listing -> output the file contents.

The speed issue is due to the authentication part of the process. From what I've seen there's no way of caching/storing/serializing the FTP connection, meaning every request to the server has to start a new request.

These are the thoughts I've had so far..

1) Have a PHP script run in a while loop with a permanent FTP connection open, but I know PHP isn't designed to be run in this way.

2) Create a daemon running node.js / java etc which is able to keep a permanent ftp connection open, and have PHP interact with that. What I'm worried about with this approach is the extra maintenance involved in writing more code which duplicates the authentication code already written in PHP.

3) ???

Any help / suggestions would be greatly appreciated!.

Answer 1

将其安排在cron作业上以使FTP脚本几乎永久地或在给定的短时间间隔内运行是否明智？

Answer 2

Why you go the extra mile to read the images from ftp?

If they are on the same server, just read them via php directly from the storage directory.

If they are not on the same server, utilize some mechanism to inform php about the latest image (for example via a text file, a GET variable etc.) and directly output http/ftp image.