I have been struggling with ftp_rawlist() experiencing a long timeout with an empty result set (and no error message). Adding ftp_pasv($conn, true) after the login solved this problem. A similar situation may be encountered with ftp_nlist().
More info here:
http://bugs.php.net/bug.php?id=32708
ftp_pasv
描述
bool ftp_pasv ( resource ftp_stream, bool pasv )如果参数 pasv 为真，打开被动模式传输 (PASV MODE) ，否则，如果参数 pasv 为假则关闭被动传输模式。在被动模式打开的情况下，数据的传送由客户机启动，而不是由服务器开始。
如果成功则返回 TRUE，失败则返回 FALSE。
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User Contributed Notes
carsonm at draughters dot com
21-Dec-2005 01:27
21-Dec-2005 01:27
22-Feb-2005 06:05
ftp_pasv has to be set after login, not after connect.
ybourbeau at edison dot ca
09-Apr-2002 06:28
09-Apr-2002 06:28
Directly from bsd FTP manual pages:
The PASV command requests that the remote server open a port for the data connection and return the address of that port. The remote server listens on that port and the client connects to it.
When using the more traditional PORT command, the client listens on a port and sends that address to the remote server, who connects back to it. Passive mode is useful when using ftp through a gateway router or host that controls the directionality of traffic. (Note that though ftp servers are required to support the PASV command by RFC 1123, some do not.)
04-Apr-2002 08:19
PASV: For ftp users behind firewall, the server LISTEN for a connection.
Non-PASV: The client LISTEN for a connection from server.