图片CDN分发，压缩html

application/core/MY_Output.php

@@ -1,107 +1,111 @@
 <?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
-{
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Write a Cache File
-	 *
-	 * @access	public
-	 * @param 	string
-	 * @return	void
-	 */
-	function _write_cache($output)
-	{
-
-
-		$cache_path = 'd:/Dropbox/wwwcache/asiahighlights.com';
-		
-		if ( ! is_dir($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
-		//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']))
-		{
-			return FALSE;
-		}
-		$cache_path=$cache_path.$_GET['static_html_url'];
-		if(mb_substr($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
-		if (@file_exists($cache_path))
-		{
-			if ( ! $fp_read = @fopen($cache_path, FOPEN_READ))
-			{
-				return FALSE;
-			}
-
-			flock($fp_read, LOCK_SH);
-
-			$cache = '';
-			if (filesize($cache_path) > 0)
-			{
-				$cache = fread($fp_read, filesize($cache_path));
-			}
-
-			flock($fp_read, LOCK_UN);
-			fclose($fp_read);
-			if(strpos($cache,'<!-- Generated by ')===false)
-			{
-				log_message('error', "is not cache file.".$cache_path);
-				return FALSE;
-			}
-		}
-		
-		///////
-
-		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))
-		{
-			fwrite($fp, $output.'<!-- Generated by '.$_SERVER['HTTP_HOST'].' ('.date('c').') -->');
-			flock($fp, LOCK_UN);
-		}
-		else
-		{
-			log_message('error', "Unable to secure a file lock for file at: ".$cache_path);
-			return;
-		}
-		fclose($fp);
-		@chmod($cache_path, FILE_WRITE_MODE);
-
-		log_message('debug', "Cache file written: ".$cache_path);
-	}
-
-	// --------------------------------------------------------------------
-
-/*
-* 递归创建文件夹
-*/
-function create_folder_by_path($dir, $mode = 0777)
-{
-    if (!is_dir($dir))
-    {
-        return @mkdir($dir, $mode, true);
+class MY_Output extends CI_Output {
+    // --------------------------------------------------------------------
+
+    /**
+     * Write a Cache File
+     *
+     * @access	public
+     * @param 	string
+     * @return	void
+     */
+    function _write_cache($output) {
+        $cache_path = 'd:/Dropbox/wwwcache/asiahighlights.com';
+
+        if (!is_dir($cache_path) OR ! is_really_writable($cache_path)) {
+            log_message('error', "Unable to write cache file: " . $cache_path);
+            return;
+        }
+
+        ///////改成按照URL保存缓存
+        //优先使用提交过来的static_html_url做文件名，这是主动生成静态文件用的参数
+        if (empty($_GET['static_html_url'])) {
+            return FALSE;
+        }
+        $cache_path = $cache_path . $_GET['static_html_url'];
+        if (mb_substr($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
+        if (@file_exists($cache_path)) {
+            if (!$fp_read = @fopen($cache_path, FOPEN_READ)) {
+                return FALSE;
+            }
+
+            flock($fp_read, LOCK_SH);
+
+            $cache = '';
+            if (filesize($cache_path) > 0) {
+                $cache = fread($fp_read, filesize($cache_path));
+            }
+
+            flock($fp_read, LOCK_UN);
+            fclose($fp_read);
+            if (strpos($cache, '<!-- Generated by ') === false) {
+                log_message('error', "is not cache file." . $cache_path);
+                return FALSE;
+            }
+        }
+
+        ///////
+
+        if (!$fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE)) {
+            log_message('error', "Unable to write cache file: " . $cache_path);
+            return;
+        }
+
+        //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 {
+            log_message('error', "Unable to secure a file lock for file at: " . $cache_path);
+            return;
+        }
+        fclose($fp);
+        @chmod($cache_path, FILE_WRITE_MODE);
+
+        log_message('debug', "Cache file written: " . $cache_path);
     }
-    return;
-}
 
-}
+    // --------------------------------------------------------------------
+
+    /*
+     * 递归创建文件夹
+     */
+    function create_folder_by_path($dir, $mode = 0777) {
+        if (!is_dir($dir)) {
+            return @mkdir($dir, $mode, true);
+        }
+        return;
+    }
+
+}