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                # PHP ftp_cdup() 函數 ## 定義和用法 ftp_cdup() 函數把當前目錄改變為 FTP 服務器上的父目錄。 若成功,則返回 true。否則返回 false。 ### 語法 ``` ftp_cdup(ftp_connection) ``` | 參數 | 描述 | | --- | --- | | ftp_connection | 必需。規定要使用的 FTP 連接(FTP 連接的標識符)。 | ## 例子 ``` <?php $conn = ftp_connect("ftp.testftp.com") or die("Could not connect"); ftp_login($conn,"admin","ert456"); //輸出當前目錄 echo "Dir: ".ftp_pwd($conn); echo "<br />"; //更改為 images 目錄 ftp_chdir($conn,"images"); echo "Dir: ".ftp_pwd($conn); echo "<br />"; //把當前目錄切換為父目錄 ftp_cdup($conn); echo "Dir: ".ftp_pwd($conn); ftp_close($ftp_server); ?> ``` 輸出: ``` Dir: / Dir: /images Dir: / ```
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