ftp_chmod(ftp_connection,mode,file)

The mode parameter consists of four numbers:
模式参数[mode parameter]由四个数字组成：

• The first number is always zero
  第一个数字通常是0
• The second number specifies permissions for the owner
  第二个数字指定了所有者特许
• The third number specifies permissions for the owner's user group
  第三个数字指定了所有者用户群的特许[permissions for the owner's user group]
• The fourth number specifies permissions for everybody else
  第四个数字制定了全局特许（即：所有人都可以使用）

Possible values (to set multiple permissions, add up the following numbers):
可用值：（如果你想扩展多种特许参数，那么你可以添加下列数字）

• 1 = execute permissions
  1 = 可执行的特许
• 2 = write permissions
  2 = 可写特许
• 4 = read permissions
  4 = 可读特许

<?php
$conn = ftp_connect("ftp.testftp.com") or die("Could not connect");
ftp_login($conn,"user","pass");

// Read and write for owner, nothing for everybody else
ftp_chmod($conn,"0600","test.txt");

// Read and write for owner, read for everybody else
ftp_chmod($conn,"0644","test.txt");

// Everything for owner, read and execute for everybody else
ftp_chmod($conn,"0755","test.txt");

// Everything for owner, read for owner's group
ftp_chmod($conn,"0740","test.txt");

ftp_close($conn);
?>