Description:
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Although from the php page we are able to connect to a secure ftp server. But change directory (cd/chdir) command inside a php page to a secure ftp server always fails.

Reproduce code:
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<?php

// set up basic connection
$conn_id = ftp_ssl_connect($ftp_server); 

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

// check connection
if ((!$conn_id) || (!$login_result)) {
   die("FTP connection has failed !");
}

echo "Current directory: " . ftp_pwd($conn_id) . "\n";

// try to change the directory to somedir
if (ftp_chdir($conn_id, "somedir")) {
   echo "Current directory is now: " . ftp_pwd($conn_id) . "\n";
} else { 
   echo "Couldn't change directory\n";
}

// close the connection
ftp_close($conn_id);
?>

Expected result:
----------------
I should get:
Current directory: \
Current directory is now: \somedir

Actual result:
--------------
I get:
Current directory: \
Couldn't change directory