FTP
ftp_systype does NOT appear to be a reliable way to detect whether it is connected, as at least for a local network connection I have here to a Windows ftp server, it can succeed without a working connection (is it cached?). Don't know if this is specific to our ftp server - perhaps it doesn't behave well when it times out links.
ftp_systype
(PHP 4, PHP 5)
ftp_systype — 返回远程 FTP 服务器的系统类型
说明
string ftp_systype
( resource $ftp_stream
)
返回远程服务器的系统类型，发生错误则返回 FALSE。
Example#1 ftp_systype() 例子
<?php
// ftp connection
$ftp = ftp_connect('ftp.keliglia.com');
ftp_login($ftp, 'user', 'password');
// get the system type
if ($type = ftp_systype($ftp)) {
echo "Keliglia is powered by $type\n";
} else {
echo "Couldn't get the systype";
}
?>
本例将述出：
Keliglia is powered by UNIX
add a note
User Contributed Notesftp_systype
jgbreezer at NOSPAM dot gmail dot com
07-Apr-2008 04:21
07-Apr-2008 04:21
Buckwheat469 at hotmail dot com
26-Jul-2006 09:41
26-Jul-2006 09:41
ftp_systype can be a good way of checking the state of a connection, since PHP doesn't have a better system to check the state of an ftp connection (is_connected would be nice).
if (!($type = ftp_systype($conn_id))) {
echo "FTP connection has failed! Trying again.\n";
$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user, $ftp_pass);
}