add IPv6 test

tests/memcachedserver.phpt

@@ -40,6 +40,7 @@ $cache->replace ('replace_key', 'value 2', 200);
 
 var_dump($cache->getVersion());
 var_dump($cache->getStats());
+var_dump($cache->getStats("empty"));
 var_dump($cache->getStats("foobar"));
 var_dump($cache->getStats("scalar"));
 var_dump($cache->getStats("numeric array"));
@@ -80,6 +81,9 @@ array(1) {
     string(3) "bar"
   }
 }
+client_id=[%s]: Stat key=[empty]
+array(0) {
+}
 client_id=[%s]: Stat key=[foobar]
 array(1) {
   ["127.0.0.1:3434"]=>

tests/memcachedserver6.phpt

@@ -0,0 +1,114 @@
+--TEST--
+MemcachedServer
+--SKIPIF--
+<?php
+if (!extension_loaded("memcached")) {
+	die("skip memcached is not loaded\n");
+}
+if (!class_exists("MemcachedServer")) {
+	die("skip memcached not built with libmemcachedprotocol support\n");
+}
+?>
+--FILE--
+<?php
+include __DIR__ . '/server.inc';
+$server = memcached_server_start('server.php', '[::1]', 3434);
+
+$cache = new Memcached();
+$cache->setOption(Memcached::OPT_BINARY_PROTOCOL, true);
+$cache->setOption(Memcached::OPT_COMPRESSION, false);
+$cache->addServer('[::1]', 3434);
+
+$cache->add("add_key", "hello", 500);
+$cache->append("append_key", "world");
+$cache->prepend("prepend_key", "world");
+
+$cache->increment("incr", 2, 1, 500);
+$cache->decrement("decr", 2, 1, 500);
+
+$cache->delete("delete_k");
+$cache->flush(1);
+
+var_dump($cache->get('get_this'));
+
+$cache->set ('set_key', 'value 1', 100);
+$cache->replace ('replace_key', 'value 2', 200);
+
+var_dump($cache->getVersion());
+var_dump($cache->getStats());
+var_dump($cache->getStats("empty"));
+var_dump($cache->getStats("foobar"));
+var_dump($cache->getStats("scalar"));
+var_dump($cache->getStats("numeric array"));
+
+$cache->quit();
+
+memcached_server_stop($server);
+?>
+Done
+--EXPECTF--
+Listening on [::1]:3434
+Incoming connection from [::1]:%s
+Incoming connection from [::1]:%s
+client_id=[%s]: Add key=[add_key], value=[hello], flags=[0], expiration=[500]
+client_id=[%s]: Append key=[append_key], value=[world], cas=[0]
+client_id=[%s]: Prepend key=[prepend_key], value=[world], cas=[0]
+client_id=[%s]: Incrementing key=[incr], delta=[2], initial=[1], expiration=[500]
+client_id=[%s]: Decrementing key=[decr], delta=[2], initial=[1], expiration=[500]
+client_id=[%s]: Delete key=[delete_k], cas=[0]
+client_id=[%s]: Flush when=[1]
+client_id=[%s]: Get key=[get_this]
+client_id=[%s]: Noop
+string(20) "Hello to you client!"
+client_id=[%s]: Set key=[set_key], value=[value 1], flags=[0], expiration=[100], cas=[0]
+client_id=[%s]: Replace key=[replace_key], value=[value 2], flags=[0], expiration=[200], cas=[0]
+client_id=[%s]: Version
+array(1) {
+  ["[::1]:3434"]=>
+  string(5) "1.1.1"
+}
+client_id=[%s]: Stat key=[]
+array(1) {
+  ["[::1]:3434"]=>
+  array(2) {
+    ["key"]=>
+    string(0) ""
+    ["foo"]=>
+    string(3) "bar"
+  }
+}
+client_id=[%s]: Stat key=[empty]
+array(0) {
+}
+client_id=[%s]: Stat key=[foobar]
+array(1) {
+  ["[::1]:3434"]=>
+  array(2) {
+    ["key"]=>
+    string(6) "foobar"
+    ["foo"]=>
+    string(3) "bar"
+  }
+}
+client_id=[%s]: Stat key=[scalar]
+array(1) {
+  ["[::1]:3434"]=>
+  array(1) {
+    [0]=>
+    string(%d) "you want it, you get it"
+  }
+}
+client_id=[%s]: Stat key=[numeric array]
+array(1) {
+  ["[::1]:3434"]=>
+  array(3) {
+    [-1]=>
+    string(3) "one"
+    [0]=>
+    string(3) "two"
+    [1]=>
+    string(5) "three"
+  }
+}
+client_id=[%s]: Client quit
+Done

tests/server.php

@@ -84,6 +84,8 @@ $server->on (Memcached::ON_STAT,
                     $values = "you want it, you get it";
                 } elseif ($key === "numeric array") {
                     $values = [-1 => "one", "two", "three"];
+                } elseif ($key === "empty") {
+                    $values = [];
                 } else {
                     $values["key"] = $key;
                     $values["foo"] = "bar";