function clear($prefix_ = null)
{
    if (null === $prefix_) {
        $prefix_ = COMPONENTS_CACHE_NAMESPACE;
    } else {
        $prefix_ = COMPONENTS_CACHE_NAMESPACE . "-{$prefix_}";
    }
    $GLOBALS['libstd/cache'] = [];
    apc_delete(new \APCIterator('user', "/^{$prefix_}*/", APC_ITER_KEY));
    if (function_exists('opcache_invalidate')) {
        $invalidate = function ($path_) {
            opcache_invalidate($path_, true);
        };
        // FIXME Only if containerized.
        \io\pathApplyFiltered('/', '/\\.php$/', $invalidate);
        // \io\pathApplyFiltered(\Components\Environment::pathApplication(), '/\.php$/', $invalidate);
        // \io\pathApplyFiltered(\Components\Environment::pathComponents(), '/\.php$/', $invalidate);
    } else {
        if (function_exists('opcache_reset')) {
            opcache_reset();
        }
    }
}
 /**
  * @see \Components\Cache_Backend::clear() clear
  */
 public function clear($prefix_ = null)
 {
     if (null === $prefix_) {
         $prefix_ = COMPONENTS_CACHE_NAMESPACE;
     } else {
         $prefix_ = COMPONENTS_CACHE_NAMESPACE . "-{$prefix_}";
     }
     apc_delete(new \APCIterator('user', "/^{$prefix_}*/", APC_ITER_KEY));
     // FIXME Implement cache/backend/opcache or separate into opcache/zend & opcache/apc in independent of cache/backend/* userland caches.
     if (function_exists('opcache_invalidate')) {
         $invalidate = function ($path_) {
             opcache_invalidate($path_, true);
         };
         // FIXME Only if containerized.
         \io\pathApplyFiltered('/', '/\\.php$/', $invalidate);
         // \io\pathApplyFiltered(\Components\Environment::pathApplication(), '/\.php$/', $invalidate);
         // \io\pathApplyFiltered(\Components\Environment::pathComponents(), '/\.php$/', $invalidate);
     } else {
         if (function_exists('opcache_reset')) {
             opcache_reset();
         }
     }
 }