ftp_cdup()

(PHP 4, PHP 5, PHP 7)

切换到当前目录的父目录

说明

ftp_cdup(resource $ftp_stream): bool

切换目录至当前目录的父目录(上级目录)。

参数

$ftp_stream

FTP 连接的标识符。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

ftp_cdup()例子

<?php 
// set up basic connection 
$conn_id = ftp_connect($ftp_server); 
// login with username and password 
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass); 
// change the current directory to html 
ftp_chdir($conn_id, 'html'); 
echo ftp_pwd($conn_id); // /html 
// return to the parent directory 
if (ftp_cdup($conn_id)) { 
  echo "cdup successful\n"; 
} else { 
  echo "cdup not successful\n"; 
} 
echo ftp_pwd($conn_id); // / 
ftp_close($conn_id); 
?>

参见

• ftp_chdir()在 FTP 服务器上改变当前目录
• ftp_pwd()返回当前目录名

ftp_cdup can only up to the parent and if you want test a directory that is not a child then you can't with ftp_cdup ;)

The below example doesn't seem to work on a windows based machine so I use this trick instead
<?php
$aPath = explode('/',ftp_pwd($conn_id));
$sHomeDir = str_repeat('../', count($aPath) - 1);
ftp_chdir($conn_id, $sHomeDir);
?>

I used a recursive cdup function until i realised i could navigate to the user's home directory from any location using ~:
<? ftp_chdir($connid, "~"); ?>