在线Gzip压缩类

PHP:

使用：
<?
include("class.gzdoc.php");
$pagepress = new gzdoc();
$pagepress->initPage();
//页面输出内容
phpinfo();
$pagepress->sendPage();
?>


class.gzdoc.php
---------------------------
<?php

Class gzdoc
{
        var $debug = false;
        var $defaultmethod = 1;
        var $useZIP = false;
        var $useDeflate = false;
        function initPage()
        {
                global $HTTP_SERVER_VARS;
                $encoding = $HTTP_SERVER_VARS["HTTP_ACCEPT_ENCODING"];

                if ( strstr($encoding, "deflate") )
                {
                        $this->useDeflate = true;
                }
                if ( strstr($encoding, "gzip") )
                {
                        $this->useZIP = true;
                }

                ob_start();
                ob_implicit_flush(0);
        }
        function sendPage()
        {
                $content = ob_get_contents();

                ob_end_clean();

                if ($this->useDeflate && $this->useZIP)
                {
                        if ($this->defaultmethod == 1)
                        {
                                $this->useZIP= false;
                        } else {
                                $this->useDeflate = false;
                        }
                }

                $lenUnCompressed = strlen($content);

                if ($this->useDeflate)
                {
                        $head = "deflate";
                        $content = gzdeflate($content,9);
                }

                if ($this->useZIP)
                {
                        $head = "gzip";
      //$content .= 'Gzip enabled ';
      $content .= '<div align="center">Gzip 压缩前:' . $lenUnCompressed . '字节';
      $content .= ' 压缩后:' . strlen(gzcompress($content, 9)) . ' 字节</div>';
                        $content = "\x1f\x8b\x08\x00\x00\x00\x00\x00" . gzcompress($content, 9);
                }

                $lenCompressed = strlen($content);

                if ($this->debug)
                {
                        echo '<HTML><BODY style="font-size:9pt;font-family:Arial,helvetical;color:#000000">';
                        echo "Size in bytes before compression: ".$lenUnCompressed." bytes<BR>";
                        echo "Size in bytes after compression: ".$lenCompressed." bytes<BR>";
                        echo "Percentage reduction: ".sprintf("%1.3f%%",100 - (($lenCompressed / $lenUnCompressed) *100)  );
                        echo '</BODY></HTML>';
                } else{
                        if ( !empty($head) )
                        {
                                header("Content-Encoding: ".$head);
                        }
      echo $content;
                }

        }
}

?>

先手册，以后有用的时候用。