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;
}
