How do I check if a directory is writeable in PHP?

to be more specific for owner/group/world

$dir_writable = substr(sprintf('%o', fileperms($folder)), -4) == "0774" ? "true" : "false";

peace...

this is the code :)

<?php 

$newFileName = '/var/www/your/file.txt';

if ( ! is_writable(dirname($newFileName))) {

    echo dirname($newFileName) . ' must writable!!!';
} else {

    // blah blah blah
}

Yes, it does work for folders....

Returns TRUE if the filename exists and is writable. The filename argument may be a directory name allowing you to check if a directory is writable.