这篇文章主要介绍了php使用gzip压缩传输js和css文件的方法,实例分析了使用gzip实现压缩js和css文件的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了php使用gzip压缩传输js和css文件的方法。分享给大家供大家参考。具体如下:
- <?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($base);
- if($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);
- }
- }
- }
希望本文所述对大家的php程序设计有所帮助。
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