public static function clearPageCache()
{
//If a clear is in progress this does nothing.
self::$cacheStats = array('dirsDeleted' => 0, 'filesDeleted' => 0, 'totalData' => 0, 'totalErrors' => 0, 'error' => '');
$cacheClearLock = WP_CONTENT_DIR . '/wfcache/clear.lock';
if (!is_file($cacheClearLock)) {
if (!touch($cacheClearLock)) {
self::$cacheStats['error'] = "Could not create a lock file {$cacheClearLock} to clear the cache.";
self::$cacheStats['totalErrors']++;
return self::$cacheStats;
}
}
$fp = fopen($cacheClearLock, 'w');
if (!$fp) {
self::$cacheStats['error'] = "Could not open the lock file {$cacheClearLock} to clear the cache. Please make sure the directory is writable by your web server.";
self::$cacheStats['totalErrors']++;
return self::$cacheStats;
}
if (flock($fp, LOCK_EX | LOCK_NB)) {
//non blocking exclusive flock attempt. If we get a lock then it continues and returns true. If we don't lock, then return false, don't block and don't clear the cache.
// This logic means that if a cache clear is currently in progress we don't try to clear the cache.
// This prevents web server children from being queued up waiting to be able to also clear the cache.
self::$lastRecursiveDeleteError = false;
self::recursiveDelete(WP_CONTENT_DIR . '/wfcache/');
if (self::$lastRecursiveDeleteError) {
self::$cacheStats['error'] = self::$lastRecursiveDeleteError;
self::$cacheStats['totalErrors']++;
}
flock($fp, LOCK_UN);
}
fclose($fp);
return self::$cacheStats;
}
public static function clearPageCache()
{
//If a clear is in progress this does nothing.
self::$cacheStats = array('dirsDeleted' => 0, 'filesDeleted' => 0, 'totalData' => 0, 'totalErrors' => 0);
$cacheClearLock = WP_CONTENT_DIR . '/wfcache/clear.lock';
if (!is_file($cacheClearLock)) {
touch($cacheClearLock);
}
$fp = fopen($cacheClearLock, 'w');
if (!$fp) {
return;
}
if (flock($fp, LOCK_EX | LOCK_NB)) {
//non blocking exclusive flock attempt. If we get a lock then it continues and returns true. If we don't lock, then return false, don't block and don't clear the cache.
// This logic means that if a cache clear is currently in progress we don't try to clear the cache.
// This prevents web server children from being queued up waiting to be able to also clear the cache.
self::recursiveDelete(WP_CONTENT_DIR . '/wfcache/');
flock($fp, LOCK_UN);
}
fclose($fp);
return self::$cacheStats;
}
