/**
  * Start the output buffer
  *
  * @since 2.0.0
  *
  * @param string $output
  * @return string
  */
 protected function ob($output = '')
 {
     // Bail if cancelling
     if (true === $this->cancel) {
         return $output;
     }
     // PHP5 and objects disappearing before output buffers?
     wp_object_cache_init();
     // $wp_object_cache was clobbered in wp-settings.php so repeat this
     $this->configure_groups();
     // Unlock regeneration
     wp_cache_delete("{$this->url_key}_genlock", $this->group);
     // Do not cache blank pages unless they are HTTP redirects
     $output = trim($output);
     if (empty($output) && (empty($this->redirect_status) || empty($this->redirect_location))) {
         return;
     }
     // Do not cache 5xx responses
     if (isset($this->status_code) && intval($this->status_code / 100) == 5) {
         return $output;
     }
     // Variants and keys
     $this->do_variants($this->vary);
     $this->generate_keys();
     // Construct and save the spider_cache
     $this->cache = array('output' => $output, 'time' => time(), 'headers' => array(), 'timer' => $this->timer_stop(false, 3), 'status_header' => $this->status_header, 'redirect_status' => $this->redirect_status, 'redirect_location' => $this->redirect_location, 'version' => $this->url_version);
     // PHP5 and higher (
     foreach (headers_list() as $header) {
         list($k, $v) = array_map('trim', explode(':', $header, 2));
         $this->cache['headers'][$k] = $v;
     }
     // Set uncached headers
     if (!empty($this->cache['headers']) && !empty($this->uncached_headers)) {
         foreach ($this->uncached_headers as $header) {
             unset($this->cache['headers'][$header]);
         }
     }
     // Set cached headers
     foreach ($this->cache['headers'] as $header => $values) {
         // Bail if cookies were set
         if (strtolower($header) === 'set-cookie') {
             return $output;
         }
         foreach ((array) $values as $value) {
             if (preg_match('/^Cache-Control:.*max-?age=(\\d+)/i', "{$header}: {$value}", $matches)) {
                 $this->max_age = intval($matches[1]);
             }
         }
     }
     // Set max-age
     $this->cache['max_age'] = $this->max_age;
     // Set cache
     wp_cache_set($this->key, $this->cache, $this->group, $this->max_age + $this->seconds + 30);
     // Cache control
     if (true === $this->cache_control) {
         // Don't clobber Last-Modified header if already set, e.g. by WP::send_headers()
         if (!isset($this->cache['headers']['Last-Modified'])) {
             header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->cache['time']) . ' GMT', true);
         }
         if (!isset($this->cache['headers']['Cache-Control'])) {
             header("Cache-Control: max-age={$this->max_age}, must-revalidate", false);
         }
     }
     $this->do_headers($this->headers);
     // Add some debug info just before <head
     if (true === $this->debug) {
         $this->add_debug_just_cached();
     }
     // Pass output to next ob handler
     return $this->cache['output'];
 }
Пример #2
0
<?php

/**
 * Plugin name: Spider-Cache
 * Plugin URI:  https://wordpress.org/plugins/wp-spider-cache/
 * Description: Fully rendered pages stored in & served from Memcached.
 * Version:     2.1.0
 */
// Exit if accessed directly
defined('ABSPATH') || exit;
// Required files
require_once WP_CONTENT_DIR . '/plugins/wp-spider-cache/includes/functions.php';
// Initialize the caches
if (!wp_skip_output_cache()) {
    wp_object_cache_init();
    wp_output_cache_init();
}
Пример #3
0
 /**
  * Clear a cached URL
  *
  * @since 2.3.0
  *
  * @param string $url
  *
  * @return boolean
  */
 public static function clean_url($url = '')
 {
     // Bail if no URL
     if (empty($url)) {
         return false;
     }
     // Bail if no persistent output cache
     if (!function_exists('wp_output_cache')) {
         return false;
     }
     // Normalize the URL
     if (0 === strpos($url, 'https://')) {
         $url = str_replace('https://', 'http://', $url);
     }
     if (0 !== strpos($url, 'http://')) {
         $url = 'http://' . $url;
     }
     $url_key = md5($url);
     // Get cache objects
     $output_cache = wp_output_cache_init();
     $object_cache = wp_object_cache_init();
     // Bail if either cache is missing
     if (empty($output_cache) || empty($object_cache)) {
         return;
     }
     wp_cache_add("{$url_key}_version", 0, $output_cache->group);
     $retval = wp_cache_incr("{$url_key}_version", 1, $output_cache->group);
     $output_cache_no_remote_group_key = array_search($output_cache->group, (array) $object_cache->no_remote_groups);
     // The *_version key needs to be replicated remotely, otherwise invalidation won't work.
     // The race condition here should be acceptable.
     if (false !== $output_cache_no_remote_group_key) {
         unset($object_cache->no_remote_groups[$output_cache_no_remote_group_key]);
         $retval = wp_cache_set("{$url_key}_version", $retval, $output_cache->group);
         $object_cache->no_remote_groups[$output_cache_no_remote_group_key] = $output_cache->group;
     }
     return $retval;
 }
Пример #4
0
/**
 * Returns the Object Cache Global.
 *
 * @since 2.0.0
 *
 * @global  WP_Spider_Cache_Object  $wp_object_cache   WordPress Object Cache
 * @return  object
 */
function wp_object_cache()
{
    if (!isset($GLOBALS['wp_object_cache'])) {
        wp_object_cache_init();
    }
    return $GLOBALS['wp_object_cache'];
}