ftp_systype()

(PHP 4, PHP 5, PHP 7)

返回远程 FTP 服务器的操作系统类型

说明

ftp_systype(resource $ftp_stream): string

返回远程服务器的系统类型，发生错误则返回FALSE。

参数

$ftp_stream

FTP 连接资源。

返回值

返回远程服务器类型，失败返回FALSE。

范例

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);
}