ftp_chmod()

(PHP 5, PHP 7)

设置 FTP 服务器上的文件权限

说明

将服务器上的文件权限设置为$mode指定的值。

参数

FTP 连接标示符。

要设置的权限值，八进制值。

远程文件名称。

返回值

操作成功返回文件新的权限，操作失败返回FALSE。

范例

ftp_chmod()函数例程

参见

• chmod()改变文件模式

Using the excellent octdec and decoct functions you can make this easy: 

Just wanted to contribute a quick note for those who are still experiencing issues with changing the permissions via FTP.
If you are having trouble with PHP recognizing the mode as an integer, you can take the previous poster's method:
$mode = octdec ( str_pad ( $mode, 4, '0', STR_PAD_LEFT ) );
And add the following snippet right after:
$mode = (int) $mode;
This will force PHP to recognize the mode as an integer when you do:
ftp_chmod ( $conn_id, $mode, $path );
These together never seem to fail for me.

It took me a while to figure out how to use this function in my situation because I needed the $mode to be passed to this function as a variable that was read from a database. Since the database returns the value as an integer without a leading zero, I could not get the operation to work because adding a leading zero in PHP turns the value into a string.
For example, this does not work in my situation: 

Adding a leading zero doesn't work either:

I tried many ways to get it to work even converting it from oct to dec using octdec and then back to decoct and nothing worked. This is the only way I was able to get it to work, with an eval statement.