PHP网站程序中开启Gzip压缩的两种方法

gzip是一种网络数据压缩传输技巧,可以让我们的带宽省70%左右，可以大大加快网页打开速度，不仅有利于用户体验，也能节约不少带宽。一般apache、Nginx等在配置文件中就能开启Gzip服务。下面我们来谈谈怎么在php网站程序中开启Gzip压缩服务：

第一种Gzip压缩方案

1、在.htaccess 中添加如下代码:

AddHandler application/x-httpd-php .css .html .js 
 #这是添加你要压缩的类型  
php_value auto_prepend_file “/home/a4284418/public_html/gzip.php” 
 #这是你给这些类型增加一个自动运行的php代码，后面一定要填你空间的绝对地址 

2、gzip.php,代码如下:

ob_start(“ob_gzhandler”); 
ob_start(“compress”); 
$pathinfo = pathinfo($_SERVER[PHP_SELF]); 
switch ($pathinfo['extension']) { 
case “css” : 
header(“Content-type: text/css”); 
break;  //scutephp.com
 case “html” : 
header(“Content-type: text/html”); 
break; 
case “js” : 
header(“Content-type: text/javascript”); 
break; 
default : 
break;
 } 
?>

第二种Gzip压缩方案

此种方案是gzip的升级版,可以将gzip的压缩文件缓存下来,避免重复压缩,

1、在.htaccess 中添加:

htaccess RewriteRule (.*.css$|.*.js$) gzip.php?$1 [L],

代码如下:

// htaccess 
RewriteRule (.*.css$|.*.js$) gzip.php?$1 [L] //项目根路径 
define(‘ABSPATH’, dirname(__FILE__).’/'); //Gzip压缩开关 
$cache = true; //存放gz文件的目录，确保可写
$cachedir = ‘gzip-cache/’;
if (!is_dir(ABSPATH.$cachedir)) { 
mkdir(ABSPATH.$cachedir); } //判断是否支持gzip 
$gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], ‘gzip’);
$deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], ‘deflate’); //看浏览器是否支持gzip 否则就是 deflate，再就是 none 
$encoding = $gzip ? ‘gzip’ : ($deflate ? ‘deflate’ : ‘none’); 
if(!isset($_SERVER['QUERY_STRING'])) exit(); 
//$key=array_shift(explode(‘?’, $_SERVER['QUERY_STRING'])); 
//$key=str_replace(‘../’,”,$key); 
$key =basename($_SERVER['QUERY_STRING']); //文件的绝对路径 
$filename=ABSPATH.$_SERVER['QUERY_STRING']; 
$symbol=’^'; $rel_path=str_replace(ABSPATH,”,dirname($filename)); 
$namespace=str_replace(‘/’,$symbol,$rel_path); 
$cache_filename=ABSPATH.$cachedir.$namespace.$symbol.basename($filename).’.gz’;//生成gz文件路径 
$type=”Content-type: text/html”; //默认的类型信息 
$pathInfo = pathinfo($filename); //根据后缀判断文件类型信息 
$ext = $pathInfo['extension']; 
switch ($ext){ 
case ‘css’: 
$type=”Content-type: text/css”; break; case ‘js’: 
$type=”Content-type: text/javascript”; 
break; 
default: 
exit(); 
} 
if($cache) { 
if(file_exists($cache_filename)) { //假如存在gz文件 
$mtime = filemtime($cache_filename); 
$gmt_mtime = gmdate(‘D, d M Y H:i:s’, $mtime) . ‘ GMT’; //读取gz文件输出 
$content = file_get_contents($cache_filename); 
header(“Last-Modified:” . $gmt_mtime); 
header(“Expires: “); header(“Cache-Control: “); 
header(“Pragma: “); 
header($type); 
header(“Tips: Normal Respond (Gzip)”); 
header(“Content-Encoding: gzip”); 
echo $content; 
}else if(file_exists($filename)) { //没有对应的gz文件 
$mtime = mktime(); 
$gmt_mtime = gmdate(‘D, d M Y H:i:s’, $mtime) . ‘ GMT’; 
$content = file_get_contents($filename);//读取文件 
$content = gzencode($content, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE);//压缩文件内容 
header(“Last-Modified:” . $gmt_mtime); 
header(“Expires: “); 
header(“Cache-Control: “); 
header(“Pragma: “); 
header($type); 
header(“Tips: Build Gzip File (Gzip)”); header (“Content-Encoding: ” . $encoding); 
header (‘Content-Length: ‘ . strlen($content)); if ($fp = fopen($cache_filename, ‘w’)) { //写入gz文件，供下次使用 
fwrite($fp, $content); fclose($fp); 
} 
echo $content;  
}else{ 
header(“HTTP/1.0 404 Not Found”);
} 
}else { //处理不使用Gzip模式下的输出。原理基本同上 if(file_exists($filename)) { 
$mtime = filemtime($filename); 
$gmt_mtime = gmdate(‘D, d M Y H:i:s’, $mtime) . ‘ GMT’; 
header(“Last-Modified:” . $gmt_mtime); 
header(“Expires: “); 
header(“Cache-Control: “); 
header(“Pragma: “); 
header($type); 
header(“Tips: Normal Respond”); 
$content = readfile($filename); 
echo $content;
 }else { 
header(“HTTP/1.0 404 Not Found”); 
}
 }  
?>