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<?php 
$filePath = '/vagrant/data/anniballo.com';

/**
 * Class FolderFilter
 */
class FolderFilter extends FilterIterator
{

    /**
     * @return bool
     */
    public function accept()
    {

        return ($this->getInnerIterator()->isDir() && !$this->getInnerIterator()->isDot());
    }
}


$filter = new FolderFilter(new DirectoryIterator($filePath));
foreach ($filter as $key => $value) {
    echo $filter->getBasename().PHP_EOL;
}

// Output:
/* 
log 
wp-admin 
wp-content 
wp-includes
*/