ftp_connect

(PHP 3 >= 3.0.13, PHP 4, PHP 5)

ftp_connect -- 建立一个新的 FTP 连接

说明

resource ftp_connect ( string host [, int port [, int timeout]] )

如果成功返回一个连接标识,失败则返回 FALSE

ftp_connect() 打开一个 FTP 连接,参数 host 为要连接的服务器。host 后面不应以斜线结尾,前面也不需要用 ftp:// 开头。可选参数port 为要连接到的 FTP 器的端口号,如果设置为0,则会按照默认端口 21 连接。

可选参数 timeout 用来设置网络传输的超时时间限制。如果 FTP 服务器软件为 omitted,则默认的值为 90 秒。超时时间可以在任何时候通过函数 ftp_set_option()ftp_get_option() 来改变或修改。

注: 参数 timeout 仅适用于 PHP 4.2.0 以上版本.

例子 1. ftp_connect() 例子

<?php

$ftp_server
= "ftp.example.com";

// set up a connection or die
$conn_id = ftp_connect($ftp_server) or die("Couldn't connect to $ftp_server");

?>

参见 ftp_close()ftp_ssl_connect()


add a note add a note User Contributed Notes
brandon dot farber at gmail dot com
11-Oct-2005 03:06
In testing, I have been unable to establish any socket connections (including FTP connections) on shutdown.  This is important if you are trying to save the FTP transfer to run after the php script has been executed (using register_shutdown_function).  I am unaware of any configuration options that control this, and I have found this affects any socket connections I have tried to establish after shutdown.

The same code works fine if it is executed at runtime, rather than on shutdown.  Since I found no documentation of this behavior, I felt it important to note somewhere.  May also be useful if this was crosslinked to fsockopen comments as well.
rainer at justchords dot com
11-Nov-2003 07:07
Connecting through a firewall also depends on the type. This is an example for the Secure Gateway FTP. First you have to connect to the firewall, then open a session to the destination ftp server. This looks like this:

// Connect to firewall
$conn_id = ftp_connect("firewall.yournet.com");

// Open a session to an external ftp site
$login_result = ftp_login ($conn_id, "userid@externalhost.com", "password");

// Check open
if ((!$conn_id) || (!$login_result)) {
       echo "Ftp-connect failed!"; die;
   } else {
       echo "Connected.";
   }

// turn on passive mode transfers
ftp_pasv ($conn_id, true) ;

... and go on ...
thomas g.
04-Mar-2003 07:35
always keep an eye on the ftp_pasv function, if you are behind a firewall or nat'ed and your scripts won't do a listing or put files to the ftp