Recursively zip a folder with PHP

    /**
     * Zips a folder provided to the destination zip file
     * @param  string $source      path to folder you want to zip
     * @param  string $destination destination zip file (will be created if it doesn't already exist)
     * @return boolean              true if successful
     */
    public function zip($source, $destination)
    {
        if (!extension_loaded('zip') || !file_exists($source)) {
            return false;
        }

        $zip = new ZipArchive();
        if(!$zip->open($destination, ZIPARCHIVE::CREATE)) {
            return false;
        }

        $source = str_replace('\\', DIRECTORY_SEPARATOR, realpath($source));
        $source = str_replace('/', DIRECTORY_SEPARATOR, $source);

        if(is_dir($source) === true) {
            $files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source), RecursiveIteratorIterator::SELF_FIRST);

            foreach ($files as $file) {
                $file = str_replace('\\', DIRECTORY_SEPARATOR, $file);
                $file = str_replace('/', DIRECTORY_SEPARATOR, $file);

                if ($file == '.' || $file == '..' || empty($file) || $file==DIRECTORY_SEPARATOR) continue;
                // Ignore "." and ".." folders
                if ( in_array(substr($file, strrpos($file, DIRECTORY_SEPARATOR)+1), array('.', '..')) )
                    continue;

                $file = realpath($file);
                $file = str_replace('\\', DIRECTORY_SEPARATOR, $file);
                $file = str_replace('/', DIRECTORY_SEPARATOR, $file);

                if (is_dir($file) === true) {
                    $d = str_replace($source . DIRECTORY_SEPARATOR, '', $file );
                    if(empty($d)) continue;
                    print "Making DIRECTORY {$d}<Br>";
                    $zip->addEmptyDir($d);
                } elseif (is_file($file) === true) {
                    $zip->addFromString(str_replace($source . DIRECTORY_SEPARATOR, '', $file), file_get_contents($file));
                } else {
                    // do nothing
                }
            }
        } elseif (is_file($source) === true) {
            $zip->addFromString(basename($source), file_get_contents($source));
        }

        return $zip->close();
    }