function flush()
{
static $done = false;
if ($done) {
return false;
}
# can't flush if WP isn't loaded
if (!function_exists('get_option')) {
return false;
}
$done = true;
global $wpdb;
$this->flush = true;
if (method_exists('static_cache', 'disable')) {
static_cache::disable();
}
# flush posts
$posts = $wpdb->get_results("SELECT ID, post_title, post_name, post_date, post_type, post_status, post_author, post_parent FROM {$wpdb->posts} WHERE post_status IN ('publish', 'private') OR post_type = 'attachment'");
# force WP widgets to flush
wp_cache_delete('widget_recent_posts', 'widget');
wp_cache_delete('recent_comments', 'widget');
wp_cache_delete('get_calendar', 'calendar');
wp_cache_delete('wp_get_archives', 'general');
wp_cache_delete('all_page_ids', 'posts');
wp_cache_delete('get_pages', 'posts');
$post_ids = array();
foreach ($posts as $post) {
$post_ids[] = $post->ID;
$this->delete($post->ID, 'posts');
$this->delete($post->ID, 'post_meta');
clean_object_term_cache($post->ID, 'post');
do_action('clean_post_cache', $post->ID);
# fill a temporary bucket so as to handle permalinks
$key = $this->key($post->ID, 'posts');
$this->cache[$key] = $post;
if (class_exists('sem_cache') && $post->post_type == 'post') {
sem_cache::do_flush_author($post->post_author);
sem_cache::do_flush_date($post->post_date);
}
}
unset($posts);
if (class_exists('sem_cache')) {
# flush get_permalink() intensive stuff before flushing terms
foreach ($post_ids as $post_id) {
sem_cache::do_flush_post($post_id);
}
# flush home
sem_cache::do_flush_home();
}
# flush terms
$terms = $wpdb->get_results("SELECT term_id, taxonomy FROM {$wpdb->term_taxonomy} WHERE count > 0");
$taxonomies = array();
$term_ids = array();
if (class_exists('sem_cache')) {
foreach ($terms as $term) {
sem_cache::do_flush_term($term->term_id, $term->taxonomy);
}
}
foreach ($terms as $term) {
$taxonomies[] = $term->taxonomy;
$term_ids[] = $term->term_id;
$this->delete($term->term_id, $term->taxonomy);
}
$taxonomies = array_unique($taxonomies);
foreach ($taxonomies as $taxonomy) {
$this->delete('all_ids', $taxonomy);
$this->delete('get', $taxonomy);
delete_option("{$taxonomy}_children");
do_action('clean_term_cache', $term_ids, $taxonomy);
}
$this->delete('last_changed', 'terms');
unset($terms);
# flush users
$user_ids = $wpdb->get_col("SELECT ID FROM {$wpdb->users}");
foreach ($user_ids as $user_id) {
$this->delete($user_id, 'users');
}
unset($user_ids);
# backup key transients
$transients = array('update_core', 'update_plugins', 'update_themes', 'sem_memberships', 'sem_update_plugins', 'sem_update_themes');
$extra = array('feed_220431e2eb0959fa9c7fcb07c6e22632', 'feed_mod_220431e2eb0959fa9c7fcb07c6e22632');
foreach (array_merge($transients, $extra) as $var) {
${$var} = get_transient($var);
}
# flush options
$options = $wpdb->get_col("SELECT option_name FROM {$wpdb->options}");
foreach ($options as $option) {
if (!in_array($option, array_merge($transients, $extra))) {
if (preg_match("/^_transient_/", $option)) {
delete_option($option);
} else {
$this->delete($option, 'options');
}
}
}
$this->delete('notoptions', 'options');
$this->delete('alloptions', 'options');
unset($options);
# restore key transients
foreach ($transients as $var) {
if (${$var} !== false) {
set_transient($var, ${$var});
}
}
if ($feed_220431e2eb0959fa9c7fcb07c6e22632 !== false) {
$var = 'feed_220431e2eb0959fa9c7fcb07c6e22632';
set_transient($var, ${$var}, min(3600, cache_timeout));
$var = 'feed_mod_220431e2eb0959fa9c7fcb07c6e22632';
set_transient($var, time(), min(3600, cache_timeout));
}
return true;
}
/**
* start()
*
* @return void
**/
static function start()
{
# some things can be taken care of at all times
switch (basename($_SERVER['REQUEST_URI'])) {
case 'favicon.ico':
# bypass WP entirely on favicon.ico
$protocol = $_SERVER["SERVER_PROTOCOL"];
if ('HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol) {
$protocol = 'HTTP/1.0';
}
$headers = array("{$protocol} 404 Not Found", 'Expires: Wed, 11 Jan 1984 05:00:00 GMT', 'Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT', 'Cache-Control: no-cache, must-revalidate, max-age=0', 'Pragma: no-cache', 'Content-Type: image/x-icon');
foreach ($headers as $header) {
header($header, true);
}
die;
case 'sitemap.xml':
case 'sitemap.xml.gz':
# let xml sitemap plugins cache themselves
return;
}
global $sem_cache_cookies;
if (!defined('WP_CACHE') || !WP_CACHE || isset($_GET['action']) || isset($_GET['doing_wp_cron']) || isset($_GET['debug']) || isset($_GET['preview']) || defined('WP_INSTALLING') && WP_INSTALLING || defined('WP_ADMIN') && WP_ADMIN || defined('DOING_CRON') && DOING_CRON || defined('DOING_AJAX') && DOING_AJAX || $_POST || !$sem_cache_cookies || array_intersect(array_keys($_COOKIE), (array) $sem_cache_cookies) || self::$nocache) {
return;
}
global $sem_mobile_agents;
$mobile_agents = $sem_mobile_agents;
// $mobile_agents = array_map('preg_quote', (array) $mobile_agents);
$mobile_agents = implode("|", $mobile_agents);
if (preg_match("{({$mobile_agents})}i", $_SERVER['HTTP_USER_AGENT'])) {
return;
}
if (preg_match("/(?=.*?\\bandroid\\b)(?=.*?\\bmobile\\b).*\$/i", $_SERVER['HTTP_USER_AGENT'])) {
return;
}
#header("Content-Type: text/plain");
#var_dump($_SERVER);
#die;
# kill static cache on multisite installs
self::$static &= !(function_exists('is_multisite') && is_multisite());
if (self::$started || headers_sent() || !self::$static && !self::$memory) {
return;
}
if (isset($_SERVER['HTTPS']) && ('on' == strtolower($_SERVER['HTTPS']) || '1' == $_SERVER['HTTPS']) || isset($_SERVER['SERVER_PORT']) && '443' == $_SERVER['SERVER_PORT']) {
self::$host = 'https://' . $_SERVER['HTTP_HOST'];
} else {
self::$host = 'http://' . $_SERVER['HTTP_HOST'];
}
$cache_id = self::$host . preg_replace("/#.*/", '', $_SERVER['REQUEST_URI']);
$cache_id = md5($cache_id);
if (self::$memory) {
$headers = wp_cache_get($cache_id, 'cached_headers');
if ($headers !== false) {
self::send_headers($headers);
$buffer = wp_cache_get($cache_id, 'cached_buffers');
if ($buffer) {
echo $buffer;
}
die;
}
} elseif (!(function_exists('is_multisite') && is_multisite())) {
# poor man's memcached
$headers = '/semi-static/' . $cache_id . '.meta';
if (cache_fs::exists($headers, cache_timeout)) {
$headers = unserialize(cache_fs::get_contents($headers));
self::send_headers($headers);
$buffer = '/semi-static/' . $cache_id . '.html';
if (cache_fs::exists($buffer)) {
cache_fs::readfile($buffer);
}
die;
}
}
self::$started = true;
ob_start(array('static_cache', 'ob_callback'));
}
