<?php
    // {{{ compressText($output)
    /**
     * Fetch gzipped output
     *
     * @author Koistya Navin <navin@php.net>
     * @author David Coallier <davidc@php.net>
     * @author Marek Kuziel <marek@kuziel.info>
     * @param  string
     * @access private
     */
    private function compressText($output)
    {
        $encoding = false;
        if (function_exists('crc32') && function_exists('gzcompress')) {
            if (strpos(' ' . $_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== false) {
                $encoding = 'x-gzip';
            }
            if (strpos(' ' . $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false) {
                $encoding = 'gzip';
            }
            if ($encoding) {
                @header('Content-Encoding: ' . $encoding);

                if (function_exists('gzencode')) {
                    $output = gzencode($output, intval($this->gzip));
                } else {
                    $output = "\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff" .
                              substr(gzcompress($output, $level), 2, -4) .
                              pack('V', crc32($output)) . pack('V', strlen($output));
                }
            }
        } else {
            return new XML_Feed_Writer_Exception("Error: compress methods (crc32, gzcompress) are not available!");
        }
        return $output;
    }
    // }}}


    // -- then later..
    try {
        $object->compressText(...);
    } catch (XML_Feed_Writer_Exception $e) {
        XML_Feed_Writer_Exception::raiseError($e->getMessage());
    }
?>