Get result was different in memcache && memcached?

The result for both memcahce and memcached different. Actually i'm using laravel 5.3 which is using memcached. i'm not getting result properly.

$em = new Memcached();
    $em->addServer('127.0.0.1', 11211);
    $em->get('test_key_1');
    Result => false

    $m = new Memcache();
    $m->addServer('127.0.0.1', 11211);
    $m->get('test_key_1');
    Result =>[
      [ 'user' => 12], [ 'user' => 13], 
    ]

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