不清楚这是什么意思.通常，客户端连接到服务器.对于Filezilla，这是一个分为两部分的软件:FTP/SFTP/FTPS服务器和客户端:
http://en.wikipedia.org/wiki/Filezilla [
如果这是您想要的，则可以找到合适的PHP FTP客户端.请参阅:
https://github.com/suin/php-ftp-client [ http://freecode.com/projects/asukphpftp [ http://webscripts.softpedia.com/script/Internet- Browsers-CC/FTP/PHP-FTP-Client-42153.html [ http://lmgtfy.com/?q=FTP+client+PHP [

Not clear what do you mean by this. Normally, a client connects to the server. As to Filezilla, this is a two-part software: an FTP/SFTP/FTPS server and a client:
http://en.wikipedia.org/wiki/Filezilla[^].

I never knew that Filezilla client part could act as a server. I also never saw a PHP API for the Filezilla client; even if it does exist, I never heard of it.

So, if you want to "connect" to Filezilla client part, I don''t know what it supposed to mean. However, if you want to connect to Filezilla server, you can always do it, but, first, you will need a PHP FTP client, and, second, then it would not matter if you are using Filezilla or not; it would work for any valid FTP server.

If this is what you want, you can find a suitable PHP FTP client. Please see:
https://github.com/suin/php-ftp-client[^],
http://freecode.com/projects/asukphpftp[^],
http://webscripts.softpedia.com/script/Internet-Browsers-C-C/FTP/PHP-FTP-Client-42153.html[^].

Try to find some more if you need:
http://lmgtfy.com/?q=FTP+client+PHP[^].

Good luck,

—SA