php实现gzip压缩html数据的代码

<?php
/**
* gzip压缩html数据
* edit by bbs.it-home.org
*/
 ob_start("ob_gzhandler");  
 ob_start("compress");  //开启压缩
 
 header("Content-type: text/Css; charset: UTF-8");  
 header("Cache-Control: must-revalidate");  
 $off = 0; # Set to a reaonable value later, say 3600 (1 hr);  
 $exp = "Expires: " . gmdate("D, d M Y H:i:s", time() + $off) . " GMT";  
 
 header($exp);  
   
function compress($buffer) {  
     $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer); // remove comments  
     $buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer); // remove tabs, spaces, newlines, etc.  
     $buffer = str_replace('{ ', '{', $buffer); // remove unnecessary spaces.  
     $buffer = str_replace(' }', '}', $buffer);  
     $buffer = str_replace('; ', ';', $buffer);  
     $buffer = str_replace(', ', ',', $buffer);  
     $buffer = str_replace(' {', '{', $buffer);  
     $buffer = str_replace('} ', '}', $buffer);  
     $buffer = str_replace(': ', ':', $buffer);  
     $buffer = str_replace(' ,', ',', $buffer);  
     $buffer = str_replace(' ;', ';', $buffer);  
     return $buffer;  
 }  
   
require_once('screen.css');  
require_once('layout.css');  
require_once('custom.php');  
require_once('titles.css');  
require_once('bus.css');   
?>