PHP Util_Environment::is_preview_mode方法代码示例

 public function __construct($blog_id = null)
 {
     if (!is_null($blog_id)) {
         $this->_blog_id = $blog_id;
         $this->_is_master = $this->_blog_id == 0;
     } else {
         if (Util_Environment::is_using_master_config()) {
             $this->_blog_id = 0;
         } else {
             $this->_blog_id = Util_Environment::blog_id();
         }
         $this->_is_master = Util_Environment::blog_id() == 0;
     }
     $this->_preview = Util_Environment::is_preview_mode();
     $this->load();
 }

 /**
  * Output buffering callback
  *
  * @param string  $buffer
  * @return string
  */
 function ob_callback($buffer)
 {
     global $wpdb;
     global $w3_late_caching_succeeded;
     if ($w3_late_caching_succeeded) {
         return $buffer;
     }
     if (Util_Content::is_database_error($buffer)) {
         status_header(503);
     } else {
         if (Util_Content::can_print_comment($buffer)) {
             /**
              * Add footer comment
              */
             $date = date_i18n('Y-m-d H:i:s');
             $host = !empty($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'localhost';
             if (Util_Environment::is_preview_mode()) {
                 $buffer .= "\r\n<!-- W3 Total Cache used in preview mode -->";
             }
             if ($this->_config->get_string('common.support') != '' || $this->_config->get_boolean('common.tweeted')) {
                 $buffer .= sprintf("\r\n<!-- Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
             } else {
                 $strings = array();
                 $strings = apply_filters('w3tc_footer_comment', $strings);
                 $buffer .= "\r\n<!-- Performance optimized by W3 Total Cache. Learn more: https://www.w3-edge.com/products/\r\n";
                 if (count($strings)) {
                     $buffer .= "\r\n" . Util_Content::escape_comment(implode("\r\n", $strings)) . "\r\n";
                 }
                 $buffer .= sprintf("\r\n Served from: %s @ %s by W3 Total Cache -->", Util_Content::escape_comment($host), $date);
             }
         }
         $buffer = Util_Bus::do_ob_callbacks(array('minify', 'newrelic', 'cdn', 'browsercache', 'pagecache'), $buffer);
     }
     return $buffer;
 }

 /**
  * Fixes environment for enabled pgcache
  *
  * @throws Util_Environment_Exceptions
  */
 private function verify_file_generic_rewrite_working()
 {
     $url = get_home_url() . '/w3tc_rewrite_test' . rand();
     if (!$this->test_rewrite($url)) {
         $key = sprintf('w3tc_rewrite_test_result_%s', substr(md5($url), 0, 16));
         $result = get_transient($key);
         $home_url = get_home_url();
         $tech_message = (Util_Environment::is_nginx() ? 'nginx configuration file' : '.htaccess file') . ' contains rules to rewrite url ' . $home_url . '/w3tc_rewrite_test into ' . $home_url . '/?w3tc_rewrite_test which, if handled by ' . 'plugin, return "OK" message.<br/>';
         $tech_message .= 'The plugin made a request to ' . $home_url . '/w3tc_rewrite_test but received: <br />' . $result . '<br />';
         $tech_message .= 'instead of "OK" response. <br />';
         $error = '<strong>W3 Total Cache error:</strong> ' . 'It appears Page Cache ' . '<acronym title="Uniform Resource Locator">URL</acronym> ' . 'rewriting is not working. ';
         if (Util_Environment::is_preview_mode()) {
             $error .= ' This could be due to using Preview mode. <a href="' . $url . '">Click here</a> to manually verify its working. It should say OK. <br />';
         }
         if (Util_Environment::is_nginx()) {
             $error .= 'Please verify that all configuration files are ' . 'included in the configuration file ' . '(and that you have reloaded / restarted nginx).';
         } else {
             $error .= 'Please verify that the server configuration ' . 'allows .htaccess';
         }
         $error .= '<br />Unfortunately disk enhanced page caching will ' . 'not function without custom rewrite rules. ' . 'Please ask your server administrator for assistance. ' . 'Also refer to <a href="' . admin_url('admin.php?page=w3tc_install') . '">the install page</a>  for the rules for your server.';
         throw new Util_Environment_Exception($error, $tech_message);
     }
 }

 /**
  * Sends headers
  *
  * @param boolean $is_404
  * @param string  $etag
  * @param integer $time
  * @param string  $compression
  * @param array   $custom_headers
  * @return boolean
  */
 function _send_headers($is_404, $time, $etag, $compression, $custom_headers = array())
 {
     $exit = false;
     $headers = is_array($custom_headers) ? $custom_headers : array();
     $curr_time = time();
     $bc_lifetime = $this->_config->get_integer('browsercache.html.lifetime');
     $expires = (is_null($time) ? $curr_time : $time) + $bc_lifetime;
     $max_age = $expires > $curr_time ? $expires - $curr_time : 0;
     if ($is_404) {
         /**
          * Add 404 header
          */
         $headers = array_merge($headers, array('Status' => 'HTTP/1.1 404 Not Found'));
     } elseif (!is_null($time) && $this->_check_modified_since($time) || $this->_check_match($etag)) {
         /**
          * Add 304 header
          */
         $headers = array_merge($headers, array('Status' => 'HTTP/1.1 304 Not Modified'));
         /**
          * Don't send content if it isn't modified
          */
         $exit = true;
     }
     if ($this->_config->get_boolean('browsercache.enabled')) {
         if ($this->_config->get_boolean('browsercache.html.last_modified')) {
             $headers = array_merge($headers, array('Last-Modified' => Util_Content::http_date($time)));
         }
         if ($this->_config->get_boolean('browsercache.html.expires')) {
             $headers = array_merge($headers, array('Expires' => Util_Content::http_date($expires)));
         }
         if ($this->_config->get_boolean('browsercache.html.cache.control')) {
             switch ($this->_config->get_string('browsercache.html.cache.policy')) {
                 case 'cache':
                     $headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public'));
                     break;
                 case 'cache_public_maxage':
                     $headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => sprintf('max-age=%d, public', $max_age)));
                     break;
                 case 'cache_validation':
                     $headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'public, must-revalidate, proxy-revalidate'));
                     break;
                 case 'cache_noproxy':
                     $headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => 'private, must-revalidate'));
                     break;
                 case 'cache_maxage':
                     $headers = array_merge($headers, array('Pragma' => 'public', 'Cache-Control' => sprintf('max-age=%d, public, must-revalidate, proxy-revalidate', $max_age)));
                     break;
                 case 'no_cache':
                     $headers = array_merge($headers, array('Pragma' => 'no-cache', 'Cache-Control' => 'max-age=0, private, no-store, no-cache, must-revalidate'));
                     break;
             }
         }
         if ($this->_config->get_boolean('browsercache.html.etag')) {
             $headers = array_merge($headers, array('ETag' => '"' . $etag . '"'));
         }
         if ($this->_config->get_boolean('browsercache.html.w3tc')) {
             $headers = array_merge($headers, array('X-Powered-By' => Util_Environment::w3tc_header()));
         }
     }
     $vary = '';
     //compressed && UAG
     if ($compression && $this->_get_mobile_group()) {
         $vary = 'Accept-Encoding,User-Agent,Cookie';
         $headers = array_merge($headers, array('Content-Encoding' => $compression));
         //compressed
     } elseif ($compression) {
         $vary = 'Accept-Encoding';
         $headers = array_merge($headers, array('Content-Encoding' => $compression));
         //uncompressed && UAG
     } elseif ($this->_get_mobile_group()) {
         $vary = 'User-Agent,Cookie';
     }
     //Add Cookie to vary if user logged in and not previously set
     if (!$this->_check_logged_in() && strpos($vary, 'Cookie') === false) {
         if ($vary) {
             $vary .= ',Cookie';
         } else {
             $vary = 'Cookie';
         }
     }
     /**
      * Add vary header
      */
     if ($vary) {
         $headers = array_merge($headers, array('Vary' => $vary));
     }
     /**
      * Disable caching for preview mode
      */
     if (Util_Environment::is_preview_mode()) {
//.........这里部分代码省略.........