gzip压缩传输js和css文件代码,PHP代码库,德仔网

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【PHP】 gzip压缩传输js和css文件
作者:步山 / 发布于2014/11/10/ 516

	<?php

	 /**
	 * 完整调用示例:
	 * 1、combine.php?t=j&b=public&fs=jslib.jquery,function
	 *
	 * 该例子调用的是网站根目录下的public/jslib/jquery.js和public/function.js

	 *
	 * 2、combine.php?t=j&fs=jslib.jquery,function
	 *
	 * 该例子调用的是网站根目录下的jslib/jquery.js和function.js
	 *
	 * 3、combine.php?t=c&b=public.css&fs=common,index
	 *
	 * 该例子调用的是网站根目录下的public/css/common.css和public/css/index.css
	 *
	 * 4、combine.php?t=c&fs=css.common
	 * 该例子调用的是网站根目录下的css/common.css
	 *
	 * 注:多个文件名之间用,分隔;只有一个文件名最后不要有,
	 * 用,分隔的多个文件会被压缩进一个文件，一次性传给浏览器
	 **/
	 $is_bad_request=false;
	 $cache = true;
	 $doc_root_uri=$_SERVER['DOCUMENT_ROOT'].'/';
	 $cachedir = $doc_root_uri . 'public/cache';
	 //文件类型，j为js，c为css
	 $type=isset($_GET['t'])?($_GET['t']=='j'||$_GET['t']=='c'?$_GET['t']:''):'';

	 //存放js和css文件的基目录, 例如:?b=public.js 代表的是/public/js文件夹，出发点是网站根目录
	 //基目录参数不是必须的，如果有基目录那么这个基目录就会附加在文件名之前
	 $base =isset($_GET['b'])?($doc_root_uri.str_replace('.','/',$_GET['b'])):$doc_root_uri;

	 //文件名列表，文件名不带后缀名.比如基目录是
	 //文件名的格式是 :基目录(如果有)+文件包名+文件名
	 //例如:类型是j,
	 // 文件名public.js.jquery
	 // 如果有基路径且为public，
	 // 那么转换后的文件名就是/public/public/js/jquery.js
	 // 如果没有基路径
	 // 那么转换后的文件名就是/public/js/jquery.js
	 //多个文件名之间用,分隔
	 $fs=isset($_GET['fs'])?str_replace('.','/',$_GET['fs']):'';
	 $fs=str_replace(',','.'.($type=='j'?'js,':'css,'),$fs);
	 $fs=$fs.($type=='j'?'.js':'.css');

	 if($type==''||$fs==''){$is_bad_request=true;}
	 //die($base);
	 ///////////////http://blog.ddian.cn
	 if($is_bad_request){header ("HTTP/1.0 503 Not Implemented");}

	 $file_type=$type=='j'?'javascript':'css';

	 $elements = explode(',',preg_replace('/([^?]*).*/', '\\1', $fs));

	 // Determine last modification date of the files
	 $lastmodified = 0;
	 while (list(,$element) = each($elements)) {
	 $path =$base . '/' . $element;

	 if (($type == 'j' && substr($path, -3) != '.js') ||
	 ($type == 'c' && substr($path, -4) != '.css')) {
	 header ("HTTP/1.0 403 Forbidden");
	 exit;
	 }

	 if (substr($path, 0, strlen($base)) != $base || !file_exists($path)) {
	 header ("HTTP/1.0 404 Not Found");
	 exit;
	 }

	 $lastmodified = max($lastmodified, filemtime($path));
	 }

	 // Send Etag hash
	 $hash = $lastmodified . '-' . md5($fs);
	 header ("Etag: \\"" . $hash . "\\"");

	 if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
	 stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) == '"' . $hash . '"')
	 {
	 // Return visit and no modifications, so do not send anything
	 header ("HTTP/1.0 304 Not Modified");
	 header ("Content-Type: text/" . $file_type);
	 header ('Content-Length: 0');
	 }
	 else
	 {
	 // First time visit or files were modified
	 if ($cache)
	 {
	 // Determine supported compression method
	 $gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');
	 $deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate');

	 // Determine used compression method
	 $encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none');

	 // Check for buggy versions of Internet Explorer
	 if (!strstr($_SERVER['HTTP_USER_AGENT'], 'Opera') &&
	 preg_match('/^Mozilla\\/4\\.0 \\(compatible; MSIE ([0-9]\\.[0-9])/i', $_SERVER['HTTP_USER_AGENT'], $matches)) {
	 $version = floatval($matches[1]);

	 if ($version < 6)
	 $encoding = 'none';

	 if ($version == 6 && !strstr($_SERVER['HTTP_USER_AGENT'], 'EV1'))
	 $encoding = 'none';
	 }

	 // Try the cache first to see if the combined files were already generated
	 $cachefile = 'cache-' . $hash . '.' . $file_type . ($encoding != 'none' ? '.' . $encoding : '');

	 if (file_exists($cachedir . '/' . $cachefile)) {
	 if ($fp = fopen($cachedir . '/' . $cachefile, 'rb')) {

	 if ($encoding != 'none') {
	 header ("Content-Encoding: " . $encoding);
	 }

	 header ("Content-Type: text/" . $file_type);
	 header ("Content-Length: " . filesize($cachedir . '/' . $cachefile));
	 fpassthru($fp);
	 fclose($fp);
	 exit;
	 }
	 }
	 }

	 // Get contents of the files
	 $contents = '';
	 reset($elements);
	 while (list(,$element) = each($elements)) {
	 $path = $base . '/' . $element;
	 $contents .= "\\n\\n" . file_get_contents($path);
	 }

	 // Send Content-Type
	 header ("Content-Type: text/" . $file_type);

	 if (isset($encoding) && $encoding != 'none')
	 {
	 // Send compressed contents
	 $contents = gzencode($contents, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE);
	 header ("Content-Encoding: " . $encoding);
	 header ('Content-Length: ' . strlen($contents));
	 echo $contents;
	 }
	 else
	 {
	 // Send regular contents
	 header ('Content-Length: ' . strlen($contents));
	 echo $contents;
	 }

	 // Store cache
	 if ($cache) {
	 if ($fp = fopen($cachedir . '/' . $cachefile, 'wb')) {
	 fwrite($fp, $contents);
	 fclose($fp);
	 }
	 }
	 }
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　压缩　　 Gzip　
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