Connect via FTP and check if directory exists

is_dir.php

<?php
// FTP login details
$ftp_server = 'yourserver.com';
$ftp_server_path = '/public_html/';
$ftp_user_name = 'username';
$ftp_user_pass = 'password';

// Connect to the FTP
$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

//List the files in this folder (non recursively)
$list = ftp_nlist($conn_id, $ftp_server_path);

// Loop entries
foreach($list as $entry) {

    // Ignore '.' and '..', more complex versions could be in an 
    // array or even a text file ala .gitignore
  if($entry != '.' && $entry != '..') {

        // Use our test function
		$is_dir = ftp_isdir($conn_id, $ftp_server_path . $entry); 

        // Log results
		if($is_dir)
            echo "$entry is a directory n";
        else
            echo "$entry is a file n";
	}
}

// Close connection
ftp_close($conn_id);

// Our is_dir function, note the @ used to suppress useless warnings
function ftp_isdir($conn_id,$dir) 
{ 
    if(@ftp_chdir($conn_id,$dir)) { 
        ftp_cdup($conn_id); 
        return true; 
    } else { 
        return false; 
    } 
}