(PHP 4, PHP 5, PHP 7)
ftp_systype — 返回远程 FTP 服务器的操作系统类型
$ftp_stream
) : string
返回远程服务器的系统类型，发生错误则返回 FALSE。
ftp_streamFTP 连接资源。
返回远程服务器类型，失败返回 FALSE。
Example #1 ftp_systype() 例子
<?php
// ftp connection
$ftp = ftp_connect('ftp.example.com');
ftp_login($ftp, 'user', 'password');
// get the system type
if ($type = ftp_systype($ftp)) {
echo "Example.com is powered by $type\n";
} else {
echo "Couldn't get the systype";
}
?>
以上例程的输出类似于：
Example.com is powerd by UNIX
ftp_systype can be a good way of checking the state of a connection, since PHP doesn't have a better system to check the state of an ftp connection (is_connected would be nice).
if (!($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);
}