PHP: delete all files/folders

deleteAll.php

<?php
    function deleteAll($directory, $empty = false) {
        $t= time() - 60*60*24*4;

        if(substr($directory,-1) == "/") {
            $directory = substr($directory,0,-1);
        }

        if(!file_exists($directory) || !is_dir($directory)) {
            return false;
        } elseif(!is_readable($directory)) {
            return false;
        } else {
            $directoryHandle = opendir($directory);

            while ($contents = readdir($directoryHandle)) {
                if($contents != '.' && $contents != '..') {
                    if(filemtime($directory . "/" . $contents) < $t) {
                        $path = $directory . "/" . $contents;

                        if(is_dir($path)) {
                            @deleteAll($path);
                        } else {
                            @unlink($path);
                        }
                    }
                }
            }

            closedir($directoryHandle);
            if($empty == false) {
                if(!@rmdir($directory)) {
                    return false;
                }
            }

            return true;
        }
    }