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

Question

Does anyone know how I can check to see if a directory is writeable in PHP?

The function is_writable doesn't work for folders. (edit: It does work. See the accepted answer.)

Answer 1

According to the PHP manual is_writable should work fine on directories.

Answer 2

I've written a little script (I call it isWritable.php) that detects all directories in the same directory the script is in and writes to the page whether each directory is writable or not. Hope this helps.

<?php
// isWritable.php detects all directories in the same directory the script is in
// and writes to the page whether each directory is writable or not.

$dirs = array_filter(glob('*'), 'is_dir');

foreach ($dirs as $dir) {
    if (is_writable($dir)) {
        echo $dir.' is writable.<br>';
    } else {
        echo $dir.' is not writable. Permissions may have to be adjusted.<br>';
    } 
}
?>

Answer 3

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
}