Output\u7ec4\u4ef6\u8d1f\u8d23\u5411\u6d4f\u89c8\u5668\u53d1\u9001\u6700\u7ec8\u8f93\u51fa\uff0c\u662fci\u6846\u67b6\u4e2d\u4f7f\u7528\u975e\u5e38\u5e7f\u6cdb\u7684\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u5728\u4e4b\u524d\u7684\u51e0\u7bc7\u6e90\u7801\u9605\u8bfb\u4e2d\uff0c\u4e5f\u4f7f\u7528\u5230\u4e86\u8fd9\u4e2a\u7ec4\u4ef6\uff0c\u4f8b\u5982\uff1aload->view() \u5728\u9605\u8bfb\u8f93\u51fa\u7ec4\u4ef6\u6e90\u7801\u7684\u65f6\u5019\uff0c\u6211\u4eec\u4e3b\u8981\u5173\u6ce8\u4ee5\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n
public function __construct()\n {\n $this->_zlib_oc = (bool) ini_get('zlib.output_compression');\n $this->_compress_output = (\n $this->_zlib_oc === FALSE\n && config_item('compress_output') === TRUE\n && extension_loaded('zlib')\n );\n\n isset(self::$func_overload) OR self::$func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));\n\n \/\/ Get mime types for later\n $this->mimes =& get_mimes();\n\n log_message('info', 'Output Class Initialized');\n }\n<\/code><\/pre>\n\u8fd9\u4e2a\u6784\u9020\u51fd\u6570\u4e2d\u4e00\u5171\u505a\u4e86\u4e09\u4ef6\u4e8b\uff1a<\/p>\n
\n- \u5224\u65ad\u662f\u5426\u53ef\u4ee5\u538b\u7f29\u8f93\u51fa\u5185\u5bb9\uff0c\u8fd9\u662f\u4e3a\u4e86\u5728\u4e4b\u540e\u7684\u8f93\u51fa\u7f13\u5b58\u4e2d\u51b3\u5b9a\u662f\u5426\u538b\u7f29\uff1b<\/li>\n
- mbstring\u662f\u5426\u53ef\u4ee5\u91cd\u8f7d\uff0c\u56e0\u4e3aci\u6846\u67b6\u4e2d\u5bf9mbstring\u6807\u51c6\u5e93\u7684\u4e00\u4e9b\u51fd\u6570\u8fdb\u884c\u4e86\u91cd\u8f7d\uff0c\u800c\u8f93\u51fa\u7ec4\u4ef6\u4e2d\u6b63\u597d\u8981\u4f7f\u7528\u91cd\u8f7d\u7684\u51fd\u6570\uff0c\u8be6\u7ec6\u4e86\u89e3\u53ef\u4ee5\u67e5\u770b’.\/system\/core\/compat\/mbstring.php’\u6587\u4ef6\uff1b<\/li>\n
- ci\u6846\u67b6\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2amimes\u5217\u8868\uff0c\u5c06mimes\u5217\u8868\u53d6\u51fa\uff0c\u4e3a\u4e86\u4e4b\u540e\u8bbe\u7f6e\u8bf7\u6c42\u5934\u65f6\u4f7f\u7528\uff1b<\/li>\n<\/ol>\n
\u4ece\u6784\u9020\u51fd\u6570\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0coutput\u5728\u8f93\u51fa\u5185\u5bb9\u4e4b\u524d\uff0c\u4f1a\u5bf9\u8981\u8f93\u51fa\u7684\u5185\u5bb9\u8fdb\u884c\u538b\u7f29\u3002<\/p>\n
2.\u8f93\u51fa\u51fd\u6570\u2014\u2014_display()<\/h3>\n \/**\n * Display Output\n *\n * Processes and sends finalized output data to the browser along\n * with any server headers and profile data. It also stops benchmark\n * timers so the page rendering speed and memory usage can be shown.\n *\n * Note: All \"view\" data is automatically put into $this->final_output\n * by controller class.\n *\n * @uses CI_Output::$final_output\n * @param string $output Output data override\n * @return void\n *\/\n public function _display($output = '')\n {\n \/\/ Note: We use load_class() because we can't use $CI =& get_instance()\n \/\/ since this function is sometimes called by the caching mechanism,\n \/\/ which happens before the CI super object is available.\n $BM =& load_class('Benchmark', 'core');\n $CFG =& load_class('Config', 'core');\n\n \/\/ Grab the super object if we can.\n if (class_exists('CI_Controller', FALSE))\n {\n $CI =& get_instance();\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Set the output data\n if ($output === '')\n {\n $output =& $this->final_output;\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Do we need to write a cache file? Only if the controller does not have its\n \/\/ own _output() method and we are not dealing with a cache file, which we\n \/\/ can determine by the existence of the $CI object above\n if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))\n {\n $this->_write_cache($output);\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Parse out the elapsed time and memory usage,\n \/\/ then swap the pseudo-variables with the data\n\n $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');\n\n if ($this->parse_exec_vars === TRUE)\n {\n $memory = round(memory_get_usage() \/ 1024 \/ 1024, 2).'MB';\n $output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Is compression requested?\n if (isset($CI) \/\/ This means that we're not serving a cache file, if we were, it would already be compressed\n && $this->_compress_output === TRUE\n && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)\n {\n ob_start('ob_gzhandler');\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Are there any server headers to send?\n if (count($this->headers) > 0)\n {\n foreach ($this->headers as $header)\n {\n @header($header[0], $header[1]);\n }\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Does the $CI object exist?\n \/\/ If not we know we are dealing with a cache file so we'll\n \/\/ simply echo out the data and exit.\n if ( ! isset($CI))\n {\n if ($this->_compress_output === TRUE)\n {\n if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)\n {\n header('Content-Encoding: gzip');\n header('Content-Length: '.self::strlen($output));\n }\n else\n {\n \/\/ User agent doesn't support gzip compression,\n \/\/ so we'll have to decompress our cache\n $output = gzinflate(self::substr($output, 10, -8));\n }\n }\n\n echo $output;\n log_message('info', 'Final output sent to browser');\n log_message('debug', 'Total execution time: '.$elapsed);\n return;\n }\n\n \/\/ --------------------------------------------------------------------\n\n \/\/ Do we need to generate profile data?\n \/\/ If so, load the Profile class and run it.\n if ($this->enable_profiler === TRUE)\n {\n $CI->load->library('profiler');\n if ( ! empty($this->_profiler_sections))\n {\n $CI->profiler->set_sections($this->_profiler_sections);\n }\n\n \/\/ If the output data contains closing <\/body> and <\/html> tags\n \/\/ we will remove them and add them back after we insert the profile data\n $output = preg_replace('|<\/body>.*?<\/html>|is', '', $output, -1, $count).$CI->profiler->run();\n if ($count > 0)\n {\n $output .= '<\/body><\/html>';\n }\n }\n\n \/\/ Does the controller contain a function named _output()?\n \/\/ If so send the output there. Otherwise, echo it.\n if (method_exists($CI, '_output'))\n {\n $CI->_output($output);\n }\n else\n {\n echo $output; \/\/ Send it to the browser!\n }\n\n log_message('info', 'Final output sent to browser');\n log_message('debug', 'Total execution time: '.$elapsed);\n }\n<\/code><\/pre>\n\u8fd9\u91cc\u4e3b\u8981\u6ce8\u610f\u7684\u662f\u538b\u7f29\u95ee\u9898\u3002<\/p>\n
\n- $_SERVER[‘HTTP_ACCEPT_ENCODING’]\u662f\u5224\u65ad\u5ba2\u6237\u7aef\u662f\u5426\u652f\u6301\u538b\u7f29<\/li>\n
- \u5982\u679c\u652f\u6301\u538b\u7f29\u4e14\u9700\u8981\u6267\u884cphp\u538b\u7f29\u4ee3\u7801\uff0c\u5982\u679c\u662f\u7f13\u5b58\uff0c\u53d1\u9001\u76f8\u5e94\u8bf7\u6c42\u5934\uff0c\u4e0d\u662f\u7f13\u5b58\uff0c\u6267\u884cphp\u7684\u538b\u7f29\u4ee3\u7801<\/li>\n
- \u5982\u679c\u4e0d\u652f\u6301\u538b\u7f29\uff0c\u5982\u679c\u662f\u7f13\u5b58\uff0c\u5219\u5728\u6267\u884cphp\u7684\u89e3\u538b\u7f29\u4ee3\u7801\u518d\u8f93\u51fa\uff08\u56e0\u4e3a\u7f13\u5b58\u7684\u5185\u5bb9\u4f1a\u8fdb\u884c\u538b\u7f29\uff09\uff0c\u4e0d\u662f\u7f13\u5b58\uff0c\u4e0d\u6267\u884c\u538b\u7f29\u4ee3\u7801<\/li>\n<\/ol>\n
3.\u5199\u7f13\u5b58_write_cache<\/h3>\n
\u7f13\u5b58\u7684\u76ee\u5f55\u53ef\u4ee5\u662f\u81ea\u5b9a\u4e49\u76ee\u5f55\uff0c\u9ed8\u8ba4\u662f’application\/cache’\u76ee\u5f55<\/p>\n
$path = $CI->config->item('cache_path');\n $cache_path = ($path === '') ? APPPATH.'cache\/' : $path;\n<\/code><\/pre>\n\u7f13\u5b58\u7684key\u662f\u6839\u636euri\u4fe1\u606f\u751f\u6210\u7684md5\u5b57\u7b26\u4e32<\/p>\n
$uri = $CI->config->item('base_url')\n .$CI->config->item('index_page')\n .$CI->uri->uri_string();\n\n if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))\n {\n if (is_array($cache_query_string))\n {\n $uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));\n }\n else\n {\n $uri .= '?'.$_SERVER['QUERY_STRING'];\n }\n }\n\n $cache_path .= md5($uri);\n<\/code><\/pre>\n$this->_compress_output\u4e3atrue\u5bf9\u8f93\u51fa\u5185\u5bb9\u6267\u884cphp\u538b\u7f29\u4ee3\u7801<\/p>\n
if ($this->_compress_output === TRUE)\n {\n $output = gzencode($output);\n\n if ($this->get_header('content-type') === NULL)\n {\n $this->set_content_type($this->mime_type);\n }\n }\n<\/code><\/pre>\n\u7f13\u5b58\u6709\u6548\u65f6\u95f4\u4ee5\u79d2\u4e3a\u5355\u4f4d\uff0c\u7f13\u5b58\u6709\u6548\u65f6\u95f4\u548c\u8bf7\u6c42\u5934\u4fe1\u606f\uff0c\u4ee5\u5e8f\u5217\u5316\u540e\u7684\u6570\u7ec4\u5b58\u5165\u7f13\u5b58\u4e2d\uff0c\u5e76\u4ee5’ENDCI—>’\u5b57\u7b26\u4e32\u4e3a\u5206\u5272\u7b26\u5408\u8f93\u51fa\u5185\u5bb9\u5206\u5f00<\/p>\n
$expire = time() + ($this->cache_expiration * 60);\n\n \/\/ Put together our serialized info.\n $cache_info = serialize(array(\n 'expire' => $expire,\n 'headers' => $this->headers\n ));\n\n $output = $cache_info.'ENDCI--->'.$output;\n<\/code><\/pre>\n\u6700\u540e\u5c06\u7f13\u5b58\u5185\u5bb9\u5199\u5165\u7f13\u5b58\u6587\u4ef6<\/p>\n
\/**\n * Write Cache\n *\n * @param string $output Output data to cache\n * @return void\n *\/\n public function _write_cache($output)\n {\n $CI =& get_instance();\n $path = $CI->config->item('cache_path');\n $cache_path = ($path === '') ? APPPATH.'cache\/' : $path;\n\n if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))\n {\n log_message('error', 'Unable to write cache file: '.$cache_path);\n return;\n }\n\n $uri = $CI->config->item('base_url')\n .$CI->config->item('index_page')\n .$CI->uri->uri_string();\n\n if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))\n {\n if (is_array($cache_query_string))\n {\n $uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));\n }\n else\n {\n $uri .= '?'.$_SERVER['QUERY_STRING'];\n }\n }\n\n $cache_path .= md5($uri);\n\n if ( ! $fp = @fopen($cache_path, 'w+b'))\n {\n log_message('error', 'Unable to write cache file: '.$cache_path);\n return;\n }\n\n if ( ! flock($fp, LOCK_EX))\n {\n log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);\n fclose($fp);\n return;\n }\n\n \/\/ If output compression is enabled, compress the cache\n \/\/ itself, so that we don't have to do that each time\n \/\/ we're serving it\n if ($this->_compress_output === TRUE)\n {\n $output = gzencode($output);\n\n if ($this->get_header('content-type') === NULL)\n {\n $this->set_content_type($this->mime_type);\n }\n }\n\n $expire = time() + ($this->cache_expiration * 60);\n\n \/\/ Put together our serialized info.\n $cache_info = serialize(array(\n 'expire' => $expire,\n 'headers' => $this->headers\n ));\n\n $output = $cache_info.'ENDCI--->'.$output;\n\n for ($written = 0, $length = self::strlen($output); $written < $length; $written += $result)\n {\n if (($result = fwrite($fp, self::substr($output, $written))) === FALSE)\n {\n break;\n }\n }\n\n flock($fp, LOCK_UN);\n fclose($fp);\n\n if ( ! is_int($result))\n {\n @unlink($cache_path);\n log_message('error', 'Unable to write the complete cache content at: '.$cache_path);\n return;\n }\n\n chmod($cache_path, 0640);\n log_message('debug', 'Cache file written: '.$cache_path);\n\n \/\/ Send HTTP cache-control headers to browser to match file cache settings.\n $this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);\n }\n<\/code><\/pre>\n4.\u8f93\u51fa\u7f13\u5b58\u5185\u5bb9\u2014\u2014_display_cache\u51fd\u6570<\/h3>\n
_display_cache\u4f1a\u901a\u8fc7Key\u627e\u5230\u5bf9\u5e94\u7684\u7f13\u5b58\u6587\u4ef6\uff0c\u7136\u540e\u53d6\u51fa\u7f13\u5b58\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u67e5\u770b\u7f13\u5b58\u4fe1\u606f\uff0c\u53cd\u5e8f\u5217\u5316\u7f13\u5b58\u4fe1\u606f\uff0c\u5f97\u5230\u7f13\u5b58\u6709\u6548\u65f6\u95f4\uff0c\u5224\u65ad\u7f13\u5b58\u662f\u5426\u6709\u6548\uff0c\u65e0\u6548\u5219\u5220\u9664\u7f13\u5b58\uff0c\u8fd4\u56deFALSE *$_SERVER[‘REQUEST_TIME’]\u53c2\u6570\u662f\u8bf7\u6c42\u65f6\u95f4<\/p>\n
if ( ! preg_match('\/^(.*)ENDCI--->\/', $cache, $match))\n {\n return FALSE;\n }\n\n $cache_info = unserialize($match[1]);\n $expire = $cache_info['expire'];\n\n $last_modified = filemtime($filepath);\n\n \/\/ Has the file expired?\n if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))\n {\n \/\/ If so we'll delete it.\n @unlink($filepath);\n log_message('debug', 'Cache file has expired. File deleted.');\n return FALSE;\n }\n<\/code><\/pre>\n\u8bbe\u7f6e\u7f13\u5b58\u8bf7\u6c42\u5934<\/p>\n
\/\/ Send the HTTP cache control headers\n $this->set_cache_header($last_modified, $expire);\n\n \/\/ Add headers from cache file.\n foreach ($cache_info['headers'] as $header)\n {\n $this->set_header($header[0], $header[1]);\n }\n\n<\/code><\/pre>\n\u8f93\u51fa\u7f13\u5b58 \u5728\u9605\u8bfbCodeIngiter.php\u7684\u65f6\u5019\uff0c\u6211\u4eec\u77e5\u9053\uff0c\u5982\u679c\u5bf9\u5e94\u8bf7\u6c42\u6709\u7f13\u5b58\u7684\u8bdd\uff0c\u5219\u4e0d\u4f1a\u521d\u59cb\u5316\u63a7\u5236\u5668\uff0c\u6240\u4ee5_display\u5c31\u662f\u901a\u8fc7\u662f\u5426\u52a0\u8f7d\u4e86\u63a7\u5236\u5668\u6765\u5224\u65ad\u8f93\u51fa\u7684\u5185\u5bb9\u662f\u4e0d\u662f\u7f13\u5b58\u7684<\/p>\n
\/\/ Display the cache\n $this->_display(self::substr($cache, self::strlen($match[0])));\n<\/code><\/pre>\n \/**\n * Update\/serve cached output\n *\n * @uses CI_Config\n * @uses CI_URI\n *\n * @param object &$CFG CI_Config class instance\n * @param object &$URI CI_URI class instance\n * @return bool TRUE on success or FALSE on failure\n *\/\n public function _display_cache(&$CFG, &$URI)\n {\n $cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache\/' : $CFG->item('cache_path');\n\n \/\/ Build the file path. The file name is an MD5 hash of the full URI\n $uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;\n\n if (($cache_query_string = $CFG->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))\n {\n if (is_array($cache_query_string))\n {\n $uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));\n }\n else\n {\n $uri .= '?'.$_SERVER['QUERY_STRING'];\n }\n }\n\n $filepath = $cache_path.md5($uri);\n\n if ( ! file_exists($filepath) OR ! $fp = @fopen($filepath, 'rb'))\n {\n return FALSE;\n }\n\n flock($fp, LOCK_SH);\n\n $cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';\n\n flock($fp, LOCK_UN);\n fclose($fp);\n\n \/\/ Look for embedded serialized file info.\n if ( ! preg_match('\/^(.*)ENDCI--->\/', $cache, $match))\n {\n return FALSE;\n }\n\n $cache_info = unserialize($match[1]);\n $expire = $cache_info['expire'];\n\n $last_modified = filemtime($filepath);\n\n \/\/ Has the file expired?\n if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))\n {\n \/\/ If so we'll delete it.\n @unlink($filepath);\n log_message('debug', 'Cache file has expired. File deleted.');\n return FALSE;\n }\n\n \/\/ Send the HTTP cache control headers\n $this->set_cache_header($last_modified, $expire);\n\n \/\/ Add headers from cache file.\n foreach ($cache_info['headers'] as $header)\n {\n $this->set_header($header[0], $header[1]);\n }\n\n \/\/ Display the cache\n $this->_display(self::substr($cache, self::strlen($match[0])));\n log_message('debug', 'Cache file is current. Sending it to browser.');\n return TRUE;\n }\n\n<\/code><\/pre>\n5.\u8bbe\u7f6e\u7f13\u5b58\u8bf7\u6c42\u5934\u2014\u2014set_cache_header\u51fd\u6570<\/h3>\n \/**\n * Set Cache Header\n *\n * Set the HTTP headers to match the server-side file cache settings\n * in order to reduce bandwidth.\n *\n * @param int $last_modified Timestamp of when the page was last modified\n * @param int $expiration Timestamp of when should the requested page expire from cache\n * @return void\n *\/\n public function set_cache_header($last_modified, $expiration)\n {\n $max_age = $expiration - $_SERVER['REQUEST_TIME'];\n\n if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))\n {\n $this->set_status_header(304);\n exit;\n }\n\n header('Pragma: public');\n header('Cache-Control: max-age='.$max_age.', public');\n header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');\n header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' 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