Memcache::flush does not delete query keys

[sergeyklay]

Expected and Actual Behavior

The Phalcon\Cache\Backend\Memcache::flush should delete keys by using statsKey

use Phalcon\Cache\Frontend\Data;
use Phalcon\Cache\Backend\Memcache;

$cache = new Memcache(new Data(['lifetime' => 20]), [
    'host'     => 'localhost',
    'port'     => 11211,
    'statsKey' => '_PHCM',
]);

$cache->save('data-flush-1', 1);
$cache->save('data-flush-2', 2);

$cache->flush();

Actual

telnet localhost 11211
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
get _PHCM
VALUE _PHCM 1 56
a:2:{s:12:"data-flush-1";i:1;s:12:"data-flush-2";i:2;}

Expected

telnet localhost 11211
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
get _PHCM
END

Details

• Phalcon version: 3.0.2-dev
• PHP Version: 7.0.9
• Operating System: Ubuntu
• Installation type: Compiling from source
• Zephir version: 0.9.4a-dev
• Server: Nginx

[sergeyklay]

Fixed in the 3.0.x branch.