diff --git a/.travis.yml b/.travis.yml
index 4f0a7a86..bd904d76 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,9 @@ php:
 - 5.6
 - 7.0
 - 7.1
-- hhvm
+- hhvm-3.30
 before_script:
+- curl -sSfL -o ~/.phpenv/versions/hhvm/bin/phpunit https://phar.phpunit.de/phpunit-5.7.phar
 - travis_retry composer install
 script:
 - ./vendor/bin/phpunit
diff --git a/src/OpenTok/StreamList.php b/src/OpenTok/StreamList.php
index 62be7ee0..5a78f5df 100644
--- a/src/OpenTok/StreamList.php
+++ b/src/OpenTok/StreamList.php
@@ -3,14 +3,17 @@
 namespace OpenTok;
 
 /**
-* An object, returned by the <a href="OpenTok.html#method_listStreams">OpenTok.listStreams()</a>
-* method, representing a list of streams in an OpenTok session.
-*/
-class StreamList {
-
-  /** @ignore */
+ * An object, returned by the <a href="OpenTok.html#method_listStreams">OpenTok.listStreams()</a>
+ * method, representing a list of streams in an OpenTok session.
+ */
+class StreamList
+{
+    /** @ignore */
     private $data;
 
+    /** @ignore */
+    private $items;
+
     /** @ignore */
     public function __construct($streamListData)
     {
@@ -19,6 +22,8 @@ public function __construct($streamListData)
 
     /**
      * Returns the number of total streams for the session ID.
+     *
+     * @return int
      */
     public function totalCount()
     {
@@ -27,12 +32,14 @@ public function totalCount()
 
     /**
      * Returns an array of Stream objects.
+     *
+     * @return array
      */
     public function getItems()
     {
-        if (!$this->items) {
+        if (!is_array($this->items)) {
             $items = array();
-            foreach($this->data['items'] as $streamData) {
+            foreach ($this->data['items'] as $streamData) {
                 $items[] = new Stream($streamData);
             }
             $this->items = $items;
@@ -40,7 +47,9 @@ public function getItems()
         return $this->items;
     }
 
-
+    /**
+     * @return array
+     */
     public function jsonSerialize()
     {
         return $this->data;
diff --git a/src/OpenTok/Util/Client.php b/src/OpenTok/Util/Client.php
index 365cb314..4c8236a5 100755
--- a/src/OpenTok/Util/Client.php
+++ b/src/OpenTok/Util/Client.php
@@ -38,7 +38,7 @@
 
 // TODO: build this dynamically
 /** @internal */
-define('OPENTOK_SDK_VERSION', '4.4.0');
+define('OPENTOK_SDK_VERSION', '4.4.1');
 /** @internal */
 define('OPENTOK_SDK_USER_AGENT', 'OpenTok-PHP-SDK/' . OPENTOK_SDK_VERSION);
 
diff --git a/tests/OpenTok/ArchiveTest.php b/tests/OpenTok/ArchiveTest.php
index 3cafb4c2..13895042 100644
--- a/tests/OpenTok/ArchiveTest.php
+++ b/tests/OpenTok/ArchiveTest.php
@@ -156,7 +156,7 @@ public function testStopsArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         // TODO: test the properties of the actual archive object
         $this->assertEquals('stopped', $this->archive->status);
@@ -195,7 +195,7 @@ public function testDeletesArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertTrue($success);
         // TODO: assert that all properties of the archive object were cleared
diff --git a/tests/OpenTok/OpenTokTest.php b/tests/OpenTok/OpenTokTest.php
index 59e80ce5..75655c58 100644
--- a/tests/OpenTok/OpenTokTest.php
+++ b/tests/OpenTok/OpenTokTest.php
@@ -126,7 +126,7 @@ public function testCreatesDefaultSession()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $p2p_preference = $this->getPostField($request, 'p2p.preference');
         $this->assertEquals('enabled', $p2p_preference);
@@ -186,7 +186,7 @@ public function testCreatesMediaRoutedAndLocationSession()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $location = $this->getPostField($request, 'location');
         $this->assertEquals('12.34.56.78', $location);
@@ -234,7 +234,7 @@ public function testCreatesMediaRelayedSession()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $p2p_preference = $this->getPostField($request, 'p2p.preference');
         $this->assertEquals('enabled', $p2p_preference);
@@ -279,7 +279,7 @@ public function testCreatesAutoArchivedSession()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $archiveMode = $this->getPostField($request, 'archiveMode');
         $this->assertEquals('always', $archiveMode);
@@ -521,7 +521,7 @@ public function testStartsArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Archive', $archive);
         $this->assertEquals(0, $archive->duration);
@@ -571,7 +571,7 @@ public function testStartsArchiveNamed()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -619,7 +619,7 @@ public function testStartsArchiveNamedDeprecated()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -666,7 +666,7 @@ public function testStartsArchiveAudioOnly()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -716,7 +716,7 @@ public function testStartsArchiveIndividualOutput()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -765,7 +765,7 @@ public function testStartsArchiveResolutionSD()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -813,7 +813,7 @@ public function testStartsArchiveResolutionHD()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals($sessionId, $body->sessionId);
@@ -857,7 +857,7 @@ public function testStopsArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Archive', $archive);
         // TODO: test the properties of the actual archive object
@@ -896,7 +896,7 @@ public function testGetsArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Archive', $archive);
         // TODO: test the properties of the actual archive object
@@ -933,7 +933,7 @@ public function testDeletesArchive()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertTrue($success);
         // TODO: test the properties of the actual archive object
@@ -968,7 +968,7 @@ public function testListsArchives()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\ArchiveList', $archiveList);
         // TODO: test the properties of the actual archiveList object and its contained archive
@@ -1004,7 +1004,7 @@ public function testListsArchivesWithOffsetAndCount()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\ArchiveList', $archiveList);
         $this->assertEquals(1, $archiveList->totalCount());
@@ -1045,7 +1045,7 @@ public function testListsArchivesWithSessionId()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\ArchiveList', $archiveList);
         $this->assertEquals(2, $archiveList->totalCount());
@@ -1131,7 +1131,7 @@ public function testForceDisconnect()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertTrue($success);
     }
@@ -1192,7 +1192,7 @@ public function testStartsBroadcast()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Broadcast', $broadcast);
         $this->assertInternalType('string', $broadcast->id);
@@ -1248,7 +1248,7 @@ public function testStartBroadcastWithOptions()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Broadcast', $broadcast);
         $this->assertInternalType('string', $broadcast->id);
@@ -1295,7 +1295,7 @@ public function testStopsBroadcast()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Broadcast', $broadcast);
         $this->assertTrue($broadcast->isStopped);
@@ -1332,7 +1332,7 @@ public function testGetsBroadcast()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\Broadcast', $broadcast);
     }
@@ -1376,7 +1376,7 @@ public function testUpdatesBroadcastLayoutWithPredefined()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
     public function testUpdatesBroadcastLayoutWithCustom()
@@ -1422,7 +1422,7 @@ public function testUpdatesBroadcastLayoutWithCustom()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
     public function testUpdatesStreamLayoutClassList()
@@ -1467,7 +1467,7 @@ public function testUpdatesStreamLayoutClassList()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
     public function testGetStream()
@@ -1506,7 +1506,7 @@ public function testGetStream()
         
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
     public function testSipCall()
@@ -1674,7 +1674,7 @@ public function testSignalData()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals('apple', $body->data);
@@ -1716,7 +1716,7 @@ public function testSignalWithConnectionId()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $body = json_decode($request->getBody());
         $this->assertEquals('random message', $body->data);
@@ -1827,7 +1827,7 @@ public function testListStreams()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
 
         $this->assertInstanceOf('OpenTok\StreamList', $streamList);
 
@@ -1871,7 +1871,7 @@ public function testsSetArchiveLayoutWithPredefined()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
     public function testsSetArchiveLayoutWithCustom()
@@ -1917,7 +1917,7 @@ public function testsSetArchiveLayoutWithCustom()
         // TODO: test the dynamically built User Agent string
         $userAgent = $request->getHeaderLine('User-Agent');
         $this->assertNotEmpty($userAgent);
-        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.0', $userAgent);
+        $this->assertStringStartsWith('OpenTok-PHP-SDK/4.4.1', $userAgent);
     }
 
 }