FTP 函数
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PHP手册

ftp_cdup

(PHP 4, PHP 5)

ftp_cdup — 切换到当前目录的父目录

说明

bool ftp_cdup ( resource $ftp_stream )

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

Example #1 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 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 切换到当前目录的父目录

用户评论:

rowie at free dot fr (11-Mar-2009 10:30)

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 ;)

rayfung at ioptional dot com (18-Jan-2009 04:50)

i think ftp_cdup can make it more nice

function dirExists($ftp, $directory = '.') {
    if (@ftp_chdir($ftp, $directory)) {
        ftp_cdup($ftp);  
        return TRUE;
    } return FALSE;
}

Anonymous (07-May-2008 05:01)

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);

?>

tom p (08-Dec-2005 12:01)

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, "~"); ?>