PHP w3_is_preview_mode函数代码示例

/**
 * Updates the plugin from older version.
 */
function w3_run_legacy_update()
{
    w3_require_once(W3TC_LIB_W3_DIR . '/ConfigWriter.php');
    $writer = new W3_ConfigWriter(w3_get_blog_id(), w3_is_preview_mode());
    $writer->import_legacy_config_and_save();
    // Only remove folders when master blog is running.
    if (w3_get_blog_id() == 0) {
        w3_remove_old_folders();
    }
}

 /**
  * Constructor
  */
 function __construct($master = false)
 {
     $preview = w3_is_preview_mode();
     if (defined('WP_ADMIN')) {
         $config_admin = w3_instance('W3_ConfigAdmin');
         $preview = $config_admin->get_boolean('previewmode.enabled');
     }
     if ($master) {
         $this->_blog_id = 0;
     } else {
         $this->_blog_id = w3_get_blog_id();
     }
     $this->_preview = $preview;
     $this->load();
 }

//.........这里部分代码省略.........
  * checking of the client's If-None-Match header, as the encoding portion of
  * the ETag will be stripped before comparison.
  * 
  * 'contentHash': (string) if given, only the ETag header can be sent with
  * content (only HTTP1.1 clients can conditionally GET). The given string 
  * should be short with no quote characters and always change when the 
  * resource changes (recommend md5()). This is not needed/used if 
  * lastModifiedTime is given.
  * 
  * 'eTag': (string) if given, this will be used as the ETag header rather
  * than values based on lastModifiedTime or contentHash. Also the encoding
  * string will not be appended to the given value as described above.
  * 
  * 'invalidate': (bool) if true, the client cache will be considered invalid
  * without testing. Effectively this disables conditional GET. 
  * (default false)
  * 
  * 'maxAge': (int) if given, this will set the Cache-Control max-age in 
  * seconds, and also set the Expires header to the equivalent GMT date. 
  * After the max-age period has passed, the browser will again send a 
  * conditional GET to revalidate its cache.
  * 
  * @return null
  */
 public function __construct($spec)
 {
     if (isset($spec['cacheHeaders']) && is_array($spec['cacheHeaders'])) {
         $this->_cacheHeaders = $spec['cacheHeaders'];
     }
     $scope = $this->_cacheHeaders['cacheheaders_enabled'] && $this->_cacheHeaders['cacheheaders'] != 'no_cache' ? 'public' : 'private';
     $maxAge = 0;
     $this->_headers['Pragma'] = $scope;
     // backwards compatibility (can be removed later)
     if (isset($spec['setExpires']) && is_numeric($spec['setExpires']) && !isset($spec['maxAge'])) {
         $spec['maxAge'] = $spec['setExpires'] - $_SERVER['REQUEST_TIME'];
     }
     if (isset($spec['maxAge'])) {
         $maxAge = $spec['maxAge'];
         if ($this->_cacheHeaders['expires_enabled'] && $maxAge) {
             $this->_headers['Expires'] = self::gmtDate($_SERVER['REQUEST_TIME'] + $maxAge);
         }
     }
     $etagAppend = '';
     if (isset($spec['encoding'])) {
         $this->_stripEtag = true;
         $this->_headers['Vary'] = 'Accept-Encoding';
         if ('' !== $spec['encoding']) {
             if (0 === strpos($spec['encoding'], 'x-')) {
                 $spec['encoding'] = substr($spec['encoding'], 2);
             }
             $etagAppend = ';' . substr($spec['encoding'], 0, 2);
         }
     }
     if (isset($spec['lastModifiedTime'])) {
         $this->_setLastModified($spec['lastModifiedTime']);
         if (isset($spec['eTag'])) {
             // Use it
             $this->_setEtag($spec['eTag'], $scope);
         } else {
             // base both headers on time
             $this->_setEtag($spec['lastModifiedTime'] . $etagAppend, $scope);
         }
     } elseif (isset($spec['eTag'])) {
         // Use it
         $this->_setEtag($spec['eTag'], $scope);
     } elseif (isset($spec['contentHash'])) {
         // Use the hash as the ETag
         $this->_setEtag($spec['contentHash'] . $etagAppend, $scope);
     }
     if ($this->_cacheHeaders['cacheheaders_enabled']) {
         switch ($this->_cacheHeaders['cacheheaders']) {
             case 'cache':
                 $this->_headers['Cache-Control'] = 'public';
                 break;
             case 'cache_public_maxage':
                 $this->_headers['Cache-Control'] = "max-age={$maxAge}, public";
                 break;
             case 'cache_validation':
                 $this->_headers['Cache-Control'] = 'public, must-revalidate, proxy-revalidate';
                 break;
             case 'cache_noproxy':
                 $this->_headers['Cache-Control'] = 'public, must-revalidate';
                 break;
             case 'cache_maxage':
                 $this->_headers['Cache-Control'] = "max-age={$maxAge}, {$scope}, must-revalidate, proxy-revalidate";
                 break;
             case 'no_cache':
                 $this->_headers['Cache-Control'] = 'max-age=0, private, no-store, no-cache, must-revalidate';
                 break;
         }
     }
     /**
      * Disable caching for preview mode
      */
     if (w3_is_preview_mode()) {
         $this->_headers = array_merge($this->_headers, array('Pragma' => 'private', 'Cache-Control' => 'private'));
     }
     // invalidate cache if disabled, otherwise check
     $this->cacheIsValid = isset($spec['invalidate']) && $spec['invalidate'] ? false : $this->_isCacheValid();
 }

 /**
  * Check if we can do modify contents
  *
  * @return boolean
  */
 function can_ob()
 {
     global $w3_late_init;
     $enabled = w3_is_preview_mode();
     $enabled = $enabled || $this->_config->get_boolean('pgcache.enabled');
     $enabled = $enabled || $this->_config->get_boolean('dbcache.enabled');
     $enabled = $enabled || $this->_config->get_boolean('objectcache.enabled');
     $enabled = $enabled || $this->_config->get_boolean('browsercache.enabled');
     $enabled = $enabled || $this->_config->get_boolean('minify.enabled');
     $enabled = $enabled || $this->_config->get_boolean('cdn.enabled');
     $enabled = $enabled || $this->_config->get_boolean('fragmentcache.enabled');
     $enabled = $enabled || w3_is_dbcluster();
     $enabled = $enabled && !$w3_late_init;
     /**
      * Check if plugin enabled
      */
     if (!$enabled) {
         return false;
     }
     /**
      * Skip if admin
      */
     if (defined('WP_ADMIN')) {
         return false;
     }
     /**
      * Skip if doing AJAX
      */
     if (defined('DOING_AJAX')) {
         return false;
     }
     /**
      * Skip if doing cron
      */
     if (defined('DOING_CRON')) {
         return false;
     }
     /**
      * Skip if APP request
      */
     if (defined('APP_REQUEST')) {
         return false;
     }
     /**
      * Skip if XMLRPC request
      */
     if (defined('XMLRPC_REQUEST')) {
         return false;
     }
     /**
      * Check for WPMU's and WP's 3.0 short init
      */
     if (defined('SHORTINIT') && SHORTINIT) {
         return false;
     }
     /**
      * Check User Agent
      */
     if (isset($_SERVER['HTTP_USER_AGENT']) && stristr($_SERVER['HTTP_USER_AGENT'], W3TC_POWERED_BY) !== false) {
         return false;
     }
     return true;
 }

//.........这里部分代码省略.........
     $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' => w3_http_date($time)));
         }
         if ($this->_config->get_boolean('browsercache.html.expires')) {
             $headers = array_merge($headers, array('Expires' => w3_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' => W3TC_POWERED_BY));
         }
     }
     $vary = '';
     //compressed && UAG
     if ($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));
     }
     /**
      * Add custom headers
      */
     $headers = array_merge($headers, $custom_headers);
     /**
      * Disable caching for preview mode
      */
     if (w3_is_preview_mode()) {
         $headers = array_merge($headers, array('Pragma' => 'private', 'Cache-Control' => 'private'));
     }
     /**
      * Send headers to client
      */
     $result = $this->_headers($headers);
     if ($exit) {
         exit;
     }
     return $result;
 }

/**
 * Returns a preview link with current state
 * @return string
 */
function w3tc_get_preview_link()
{
    w3_require_once(W3TC_INC_FUNCTIONS_DIR . '/ui.php');
    return w3_is_preview_mode() ? w3_button_link(__('Stop Previewing', 'w3-total-cache'), wp_nonce_url(w3_admin_url('admin.php?page=w3tc_dashboard&w3tc_default_stop_previewing'), 'w3tc'), false) : w3_button_link(__('Preview', 'w3-total-cache'), wp_nonce_url(w3_admin_url('admin.php?page=w3tc_dashboard&w3tc_default_previewing'), 'w3tc'), true);
}

 private function verify_file_generic_rewrite_working()
 {
     $url = w3_get_home_url() . '/w3tc_rewrite_test';
     if (!$this->test_rewrite($url)) {
         $key = sprintf('w3tc_rewrite_test_result_%s', substr(md5($url), 0, 16));
         $result = get_transient($key);
         $home_url = w3_get_home_url();
         $tech_message = (w3_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 (w3_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 (w3_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';
         }
         $error .= '<br />Unfortunately disk enhanced page caching will ' . 'not function without custom rewrite rules. ' . 'Please ask your server administrator for assistance. ' . 'Also refer to <a href="' . admin_url('admin.php?page=w3tc_install') . '">the install page</a>  for the rules for your server.';
         throw new SelfTestFailedException($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 = array();
     $curr_time = time();
     $expires = $time + $this->_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 ($this->_check_modified_since($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;
     }
     /**
      * Add default headers
      */
     $headers = array_merge($headers, array('Last-Modified' => w3_http_date($time), 'Vary' => 'Cookie'));
     if ($this->_config->get_boolean('browsercache.enabled')) {
         if ($this->_config->get_boolean('browsercache.html.expires')) {
             $headers = array_merge($headers, array('Expires' => w3_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_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' => 'public, 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' => W3TC_POWERED_BY));
         }
     }
     if ($compression) {
         /**
          * Add Content-Encoding header
          */
         $headers = array_merge($headers, array('Vary' => 'Accept-Encoding, Cookie', 'Content-Encoding' => $compression));
     }
     /**
      * Add custom headers
      */
     $headers = array_merge($headers, $custom_headers);
     /**
      * Disable caching for preview mode
      */
     if (w3_is_preview_mode()) {
         $headers = array_merge($headers, array('Pragma' => 'private', 'Cache-Control' => 'private'));
     }
     /**
      * Send headers to client
      */
     $result = $this->_headers($headers);
     if ($exit) {
         exit;
     }
     return $result;
 }

 /**
  * Saves config
  *
  * @param boolean preview
  * @return boolean
  */
 function save($preview = null)
 {
     if ($preview === null) {
         $preview = w3_is_preview_mode();
     }
     if ($preview) {
         return $this->write(W3TC_CONFIG_PREVIEW_PATH);
     }
     return $this->write(W3TC_CONFIG_PATH);
 }