图片CDN分发，压缩html

application/core/MY_Output.php

@@ -1,11 +1,12 @@
 <?php
 
+//加载第三方用于解析html的类
+require '/lib/simple_html_dom.php';
+
 if (!defined('BASEPATH'))
     exit('No direct script access allowed');
 
-class MY_Output extends CI_Output
+class MY_Output extends CI_Output {
-{
-	
     // --------------------------------------------------------------------
 
     /**
@@ -15,52 +16,42 @@ class MY_Output extends CI_Output
      * @param 	string
      * @return	void
      */
-	function _write_cache($output)
+    function _write_cache($output) {
-	{
-
-
         $cache_path = 'd:/Dropbox/wwwcache/asiahighlights.com';
 
-		if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
+        if (!is_dir($cache_path) OR ! is_really_writable($cache_path)) {
-		{
             log_message('error', "Unable to write cache file: " . $cache_path);
             return;
         }
 
-		///////改成按照URL保存缓存
+        ///////改成按照URL保存缓存
-		//优先使用提交过来的static_html_url做文件名，这是主动生成静态文件用的参数
+        //优先使用提交过来的static_html_url做文件名，这是主动生成静态文件用的参数
-		if(empty($_GET['static_html_url']))
+        if (empty($_GET['static_html_url'])) {
-		{
             return FALSE;
         }
         $cache_path = $cache_path . $_GET['static_html_url'];
-		if(mb_substr($cache_path,-1,1)=='/')
+        if (mb_substr($cache_path, -1, 1) == '/') {
-		{
             $cache_path.='index.htm';
         }
 
         $this->create_folder_by_path(dirname($cache_path));
 
-		//如果文件存在，先判断是否为缓存文件，防止覆盖原始程序文件
+        //如果文件存在，先判断是否为缓存文件，防止覆盖原始程序文件
-		if (@file_exists($cache_path))
+        if (@file_exists($cache_path)) {
-		{
+            if (!$fp_read = @fopen($cache_path, FOPEN_READ)) {
-			if ( ! $fp_read = @fopen($cache_path, FOPEN_READ))
-			{
                 return FALSE;
             }
 
             flock($fp_read, LOCK_SH);
 
             $cache = '';
-			if (filesize($cache_path) > 0)
+            if (filesize($cache_path) > 0) {
-			{
                 $cache = fread($fp_read, filesize($cache_path));
             }
 
             flock($fp_read, LOCK_UN);
             fclose($fp_read);
-			if(strpos($cache,'<!-- Generated by ')===false)
+            if (strpos($cache, '<!-- Generated by ') === false) {
-			{
                 log_message('error', "is not cache file." . $cache_path);
                 return FALSE;
             }
@@ -68,19 +59,34 @@ class MY_Output extends CI_Output
 
         ///////
 
-		if ( ! $fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE))
+        if (!$fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE)) {
-		{
             log_message('error', "Unable to write cache file: " . $cache_path);
             return;
         }
 
-		if (flock($fp, LOCK_EX))
+        //解析html，生成不同版本的静态文件
-		{
+        //替换图片地址，用CDN分发
+        $html_object = str_get_html($output);
+        if (!empty($html_object)) {
+            foreach ($html_object->find('img') as $image) {
+                if (strpos($image->src, '/pic/') !== false) {
+                    $image->src = 'https://data.asiahighlights.com' . $image->src;
+                } else if (strpos($image->src, '/image/') !== false) {
+                    $image->src = 'https://data.asiahighlights.com' . $image->src;
+                }
+            }
+            $output = $html_object->save();
+        }
+        //删除多余空格和换行符
+        $output = str_replace(array("    ", "\t", "\n", "\r"), " ", $output);
+        $output = str_replace("    ", " ", $output);
+        ////// 
+
+
+        if (flock($fp, LOCK_EX)) {
             fwrite($fp, $output . '<!-- Generated by ' . $_SERVER['HTTP_HOST'] . ' (' . date('c') . ') -->');
             flock($fp, LOCK_UN);
-		}
+        } else {
-		else
-		{
             log_message('error', "Unable to secure a file lock for file at: " . $cache_path);
             return;
         }
@@ -93,12 +99,10 @@ class MY_Output extends CI_Output
     // --------------------------------------------------------------------
 
     /*
-* 递归创建文件夹
+     * 递归创建文件夹
      */
-function create_folder_by_path($dir, $mode = 0777)
+    function create_folder_by_path($dir, $mode = 0777) {
-{
+        if (!is_dir($dir)) {
-    if (!is_dir($dir))
-    {
             return @mkdir($dir, $mode, true);
         }
         return;