php使用gzip压缩传输js和css文件的方法
author:一佰互联 2019-04-27   click:208

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。