function clear_wp_redis_cache()
{
include_once "predis5.2.php";
//we need this to use Redis inside of PHP
$args = array('post_type' => 'any', 'posts_per_page' => -1);
$wp_query = new WP_Query($args);
// to get all Posts
$redis = new Predis_Client();
// Loop all posts and clear the cache
$i = 0;
while ($wp_query->have_posts()) {
$wp_query->the_post();
$incremented = false;
$permalink = get_permalink();
$redis_key = md5($permalink);
$redis_ssl_key = 'ssl_' . $redis_key;
if ($redis->exists($redis_key) == true) {
$redis->del($redis_key);
$i++;
$incremented = true;
}
if ($redis->exists($redis_ssl_key) == true) {
$redis->del($redis_ssl_key);
if (!$incremented) {
$i++;
}
}
}
echo $i . " of " . $wp_query->found_posts . " posts was cleared in cache";
die;
}
/**
* Clean up tag id lists since as keys expire the ids remain in the tag id lists
*/
protected function _collectGarbage()
{
// Clean up expired keys from tag id set and global id set
$exists = array();
$tags = (array) $this->_redis->sMembers(self::SET_TAGS);
foreach ($tags as $tag) {
// Get list of expired ids for each tag
$tagMembers = $this->_redis->sMembers(self::PREFIX_TAG_IDS . $tag);
$numTagMembers = count($tagMembers);
$expired = array();
$numExpired = $numNotExpired = 0;
if ($numTagMembers) {
while ($id = array_pop($tagMembers)) {
if (!isset($exists[$id])) {
$exists[$id] = $this->_redis->exists(self::PREFIX_KEY . $id);
}
if ($exists[$id]) {
$numNotExpired++;
} else {
$numExpired++;
$expired[] = $id;
// Remove incrementally to reduce memory usage
if (count($expired) % 100 == 0 && $numNotExpired > 0) {
$this->_redis->sRem(self::PREFIX_TAG_IDS . $tag, $expired);
if ($this->_notMatchingTags) {
// Clean up expired ids from ids set
$this->_redis->sRem(self::SET_IDS, $expired);
}
$expired = array();
}
}
}
if (!count($expired)) {
continue;
}
}
// Remove empty tags or completely expired tags
if ($numExpired == $numTagMembers) {
$this->_redis->del(self::PREFIX_TAG_IDS . $tag);
$this->_redis->sRem(self::SET_TAGS, $tag);
} else {
if (count($expired)) {
$this->_redis->sRem(self::PREFIX_TAG_IDS . $tag, $expired);
if ($this->_notMatchingTags) {
// Clean up expired ids from ids set
$this->_redis->sRem(self::SET_IDS, $expired);
}
}
}
unset($expired);
}
// Clean up global list of ids for ids with no tag
if ($this->_notMatchingTags) {
// TODO
}
}
die("Error occurred. Error message: " . $e->getMessage());
}
}
//Either manual refresh cache by adding ?refresh=secret_string after the URL or somebody posting a comment
if (refreshHasSecret($secret_string) || requestHasSecret($secret_string) || isRemotePageLoad($current_url, $websiteIp)) {
if ($debug) {
echo "<!-- manual refresh was required -->\n";
}
$redis->del($redis_key);
$redis->del("ssl_" . $redis_key);
require $wp_blog_header_path;
//$unlimited = get_option('wp-redis-cache-debug',false);
$seconds_cache_redis = get_option('wp-redis-cache-seconds', 86400);
// This page is cached, lets display it
} else {
if ($redis->exists($redis_key)) {
if ($debug) {
echo "<!-- serving page from cache: key: {$redis_key} -->\n";
}
$cache = true;
$html_of_page = $redis->get($redis_key);
if ($compress) {
$html_of_page = gzuncompress($html_of_page);
}
echo $html_of_page;
// If the cache does not exist lets display the user the normal page without cache, and then fetch a new cache page
} else {
if ($_SERVER['REMOTE_ADDR'] != $websiteIp && strstr($current_url, 'preview=true') == false) {
if ($debug) {
echo "<!-- displaying page without cache -->\n";
}
/**
* @see sfCache
*/
public function has($key)
{
return $this->redis->exists($this->getKey($key));
}