wavelog/application/libraries/Permissions.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Permissions {

	/*
	*	Class Description: Provide functions for checking file and folder permissions
  	*/

	function is_really_writable($folder) {
		// Get the absolute path to the folder
		$path = FCPATH . $folder;

		// Check if the folder exists
		if (!file_exists($path)) {
			return false;
		}

		// Check if the folder is writable
		if (is_writable($path)) {
			// Check if the subdirectories are writable (recursive check)
			$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path));
			foreach ($iterator as $item) {
				if ($item->isDir() && basename($item->getPathName()) != '..') {
					if (!is_writable($item->getRealPath())) {
						return false;
					}
				}
			}

			return true;
		}

		return false;
	}
}

/* End of file Permissions.php */