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ftp_cdup

(PHP 4, PHP 5, PHP 7, PHP 8)

ftp_cdup — 切换到当前目录的父目录

说明

ftp_cdup(FTP\Connection $ftp): bool

切换目录至当前目录的父目录 (上级目录)。

参数

ftp: FTP\Connection 实例。

返回值

成功时返回 true，或者在失败时返回 false。

更新日志

版本	说明
8.1.0	现在 `ftp` 参数接受 FTP\Connection 实例，之前接受 resource。

示例

示例 #1 ftp_cdup() 例子

<?php 
// set up basic connection 
$ftp = ftp_connect($ftp_server); 

// login with username and password 
$login_result = ftp_login($ftp, $ftp_user_name, $ftp_user_pass); 

// change the current directory to html 
ftp_chdir($ftp, 'html'); 

echo ftp_pwd($ftp); // /html 

// return to the parent directory 
if (ftp_cdup($ftp)) { 
  echo "cdup successful\n"; 
} else { 
  echo "cdup not successful\n"; 
} 

echo ftp_pwd($ftp); // / 

ftp_close($ftp); 
?>

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

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User Contributed Notes 3 notes

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tom p ¶

19 years ago


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, "~"); ?>

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rowie at free dot fr ¶

15 years ago


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 ;)

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Anonymous ¶

16 years ago


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);

?>

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