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; $contents .= "" . file_get_contents($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。