diff --git a/.gitignore b/.gitignore
index 987e2a25..81b92580 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 composer.lock
+phpunit.xml
 vendor
diff --git a/src/ExtEvLoop.php b/src/ExtEvLoop.php
new file mode 100644
index 00000000..95f41880
--- /dev/null
+++ b/src/ExtEvLoop.php
@@ -0,0 +1,244 @@
+<?php
+
+namespace React\EventLoop;
+
+use SplObjectStorage;
+use React\EventLoop\Timer\Timer;
+use React\EventLoop\Timer\TimerInterface;
+use React\EventLoop\Tick\FutureTickQueue;
+use React\EventLoop\Tick\NextTickQueue;
+
+class ExtEvLoop implements LoopInterface
+{
+    private $loop;
+    private $nextTickQueue;
+    private $futureTickQueue;
+    private $timers;
+    private $readEvents     = array();
+    private $writeEvents    = array();
+
+    private $running        = false;
+
+    public function __construct()
+    {
+        $this->loop             = new \EvLoop();
+        $this->timers           = new SplObjectStorage();
+        $this->nextTickQueue    = new NextTickQueue($this);
+        $this->futureTickQueue  = new FutureTickQueue($this);
+        $this->timers           = new SplObjectStorage();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addReadStream($stream, callable $listener)
+    {
+        $this->addStream($stream, $listener, \Ev::READ);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addWriteStream($stream, callable $listener)
+    {
+        $this->addStream($stream, $listener, \Ev::WRITE);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeReadStream($stream)
+    {
+        $key = (int) $stream;
+        if (isset($this->readEvents[$key])) {
+            $this->readEvents[$key]->stop();
+            unset($this->readEvents[$key]);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeWriteStream($stream)
+    {
+        $key = (int) $stream;
+        if (isset($this->writeEvents[$key])) {
+            $this->writeEvents[$key]->stop();
+            unset($this->writeEvents[$key]);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function removeStream($stream)
+    {
+        $this->removeReadStream($stream);
+        $this->removeWriteStream($stream);
+    }
+
+    /**
+     * Wraps the listener in a callback which will pass the
+     * stream to the listener then registers the stream with
+     * the eventloop.
+     *
+     * @param resource    $stream   PHP Stream resource
+     * @param callable    $listener stream callback
+     * @param int         $flags    flag bitmask
+     */
+    private function addStream($stream, callable $listener, $flags)
+    {
+        $listener = function ($event) use ($stream, $listener) {
+            call_user_func($listener, $stream, $this);
+        };
+
+        $event = $this->loop->io($stream, $flags, $listener);
+
+        if (($flags & \Ev::READ) === $flags) {
+            $this->readEvents[(int)$stream] = $event;
+        } elseif (($flags & \Ev::WRITE) === $flags) {
+            $this->writeEvents[(int)$stream] = $event;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addTimer($interval, callable $callback)
+    {
+        $timer = new Timer($this, $interval, $callback, false);
+        $this->setupTimer($timer);
+
+        return $timer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addPeriodicTimer($interval, callable $callback)
+    {
+        $timer = new Timer($this, $interval, $callback, true);
+        $this->setupTimer($timer);
+
+        return $timer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function cancelTimer(TimerInterface $timer)
+    {
+        if (isset($this->timers[$timer])) {
+            /* stop EvTimer */
+            $this->timers[$timer]->stop();
+
+            /* defer timer */
+            $this->nextTick(function() use ($timer) {
+                $this->timers->detach($timer);
+            });
+        }
+    }
+
+    /**
+     * Add timer object as
+     * @param  TimerInterface $timer [description]
+     * @return [type]                [description]
+     */
+    private function setupTimer(TimerInterface $timer)
+    {
+        $callback = function () use ($timer) {
+            call_user_func($timer->getCallback(), $timer);
+
+            if (!$timer->isPeriodic()) {
+                $timer->cancel();
+            }
+        };
+
+        $interval = $timer->getInterval();
+
+        $libevTimer = $this->loop->timer($interval, $interval, $callback);
+
+        $this->timers->attach($timer, $libevTimer);
+
+        return $timer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isTimerActive(TimerInterface $timer)
+    {
+        return $this->timers->contains($timer);
+    }
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function nextTick(callable $listener)
+    {
+        $this->nextTickQueue->add($listener);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function futureTick(callable $listener)
+    {
+        $this->futureTickQueue->add($listener);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function tick()
+    {
+        $this->nextTickQueue->tick();
+        $this->futureTickQueue->tick();
+
+        $flags = \Ev::RUN_ONCE;
+        if (!$this->running || !$this->nextTickQueue->isEmpty() || !$this->futureTickQueue->isEmpty()) {
+            $flags |= \Ev::RUN_NOWAIT;
+        } elseif (!$this->readEvents && !$this->writeEvents && !$this->timers->count()) {
+            $this->running = false;
+            return;
+        }
+        $this->loop->run($flags);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function run()
+    {
+        $this->running = true;
+
+        while($this->running) {
+            $this->tick();
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function stop()
+    {
+        $this->running = false;
+    }
+
+    public function __destruct()
+    {
+        // mannually stop all watchers
+        foreach ($this->timers as $timer) {
+            $this->timers[$timer]->stop();
+        }
+
+        foreach ($this->readEvents as $event) {
+            $event->stop();
+        }
+
+        foreach ($this->writeEvents as $event) {
+            $event->stop();
+        }
+    }
+}
diff --git a/src/ExtEventLoop.php b/src/ExtEventLoop.php
index 40b860ae..48657f96 100644
--- a/src/ExtEventLoop.php
+++ b/src/ExtEventLoop.php
@@ -236,8 +236,8 @@ private function scheduleTimer(TimerInterface $timer)
     /**
      * Create a new ext-event Event object, or update the existing one.
      *
-     * @param stream  $stream
-     * @param integer $flag   Event::READ or Event::WRITE
+     * @param resource $stream
+     * @param integer  $flag   Event::READ or Event::WRITE
      */
     private function subscribeStreamEvent($stream, $flag)
     {
@@ -263,8 +263,8 @@ private function subscribeStreamEvent($stream, $flag)
      * Update the ext-event Event object for this stream to stop listening to
      * the given event type, or remove it entirely if it's no longer needed.
      *
-     * @param stream  $stream
-     * @param integer $flag   Event::READ or Event::WRITE
+     * @param resource $stream
+     * @param integer  $flag   Event::READ or Event::WRITE
      */
     private function unsubscribeStreamEvent($stream, $flag)
     {
diff --git a/src/Factory.php b/src/Factory.php
index 207bc13c..9a481e35 100644
--- a/src/Factory.php
+++ b/src/Factory.php
@@ -9,9 +9,9 @@ public static function create()
         // @codeCoverageIgnoreStart
         if (function_exists('event_base_new')) {
             return new LibEventLoop();
-        } else if (class_exists('libev\EventLoop', false)) {
+        } elseif (class_exists('libev\EventLoop', false)) {
             return new LibEvLoop;
-        } else if (class_exists('EventBase', false)) {
+        } elseif (class_exists('EventBase', false)) {
             return new ExtEventLoop;
         }
 
diff --git a/src/LibEventLoop.php b/src/LibEventLoop.php
index a55d6104..6fbc8269 100644
--- a/src/LibEventLoop.php
+++ b/src/LibEventLoop.php
@@ -237,8 +237,8 @@ private function scheduleTimer(TimerInterface $timer)
     /**
      * Create a new ext-libevent event resource, or update the existing one.
      *
-     * @param stream  $stream
-     * @param integer $flag   EV_READ or EV_WRITE
+     * @param resource $stream
+     * @param integer  $flag   EV_READ or EV_WRITE
      */
     private function subscribeStreamEvent($stream, $flag)
     {
@@ -267,8 +267,8 @@ private function subscribeStreamEvent($stream, $flag)
      * Update the ext-libevent event resource for this stream to stop listening to
      * the given event type, or remove it entirely if it's no longer needed.
      *
-     * @param stream  $stream
-     * @param integer $flag   EV_READ or EV_WRITE
+     * @param resource $stream
+     * @param integer  $flag   EV_READ or EV_WRITE
      */
     private function unsubscribeStreamEvent($stream, $flag)
     {
diff --git a/src/LoopInterface.php b/src/LoopInterface.php
index 24a80a3d..d046526c 100644
--- a/src/LoopInterface.php
+++ b/src/LoopInterface.php
@@ -9,7 +9,7 @@ interface LoopInterface
     /**
      * Register a listener to be notified when a stream is ready to read.
      *
-     * @param stream   $stream   The PHP stream resource to check.
+     * @param resource $stream   The PHP stream resource to check.
      * @param callable $listener Invoked when the stream is ready.
      */
     public function addReadStream($stream, callable $listener);
@@ -17,7 +17,7 @@ public function addReadStream($stream, callable $listener);
     /**
      * Register a listener to be notified when a stream is ready to write.
      *
-     * @param stream   $stream   The PHP stream resource to check.
+     * @param resource $stream   The PHP stream resource to check.
      * @param callable $listener Invoked when the stream is ready.
      */
     public function addWriteStream($stream, callable $listener);
@@ -25,21 +25,21 @@ public function addWriteStream($stream, callable $listener);
     /**
      * Remove the read event listener for the given stream.
      *
-     * @param stream $stream The PHP stream resource.
+     * @param resource $stream The PHP stream resource.
      */
     public function removeReadStream($stream);
 
     /**
      * Remove the write event listener for the given stream.
      *
-     * @param stream $stream The PHP stream resource.
+     * @param resource $stream The PHP stream resource.
      */
     public function removeWriteStream($stream);
 
     /**
      * Remove all listeners for the given stream.
      *
-     * @param stream $stream The PHP stream resource.
+     * @param resource $stream The PHP stream resource.
      */
     public function removeStream($stream);
 
@@ -49,8 +49,8 @@ public function removeStream($stream);
      * The execution order of timers scheduled to execute at the same time is
      * not guaranteed.
      *
-     * @param numeric  $interval The number of seconds to wait before execution.
-     * @param callable $callback The callback to invoke.
+     * @param int|float $interval The number of seconds to wait before execution.
+     * @param callable  $callback The callback to invoke.
      *
      * @return TimerInterface
      */
@@ -62,8 +62,8 @@ public function addTimer($interval, callable $callback);
      * The execution order of timers scheduled to execute at the same time is
      * not guaranteed.
      *
-     * @param numeric  $interval The number of seconds to wait before execution.
-     * @param callable $callback The callback to invoke.
+     * @param int|float $interval The number of seconds to wait before execution.
+     * @param callable  $callback The callback to invoke.
      *
      * @return TimerInterface
      */
diff --git a/src/Timer/Timer.php b/src/Timer/Timer.php
index ac64d2b0..f670ab3c 100644
--- a/src/Timer/Timer.php
+++ b/src/Timer/Timer.php
@@ -14,6 +14,15 @@ class Timer implements TimerInterface
     protected $periodic;
     protected $data;
 
+    /**
+     * Constructor initializes the fields of the Timer
+     *
+     * @param LoopInterface $loop     The loop with which this timer is associated
+     * @param float         $interval The interval after which this timer will execute, in seconds
+     * @param callable      $callback The callback that will be executed when this timer elapses
+     * @param bool          $periodic Whether the time is periodic
+     * @param mixed         $data     Arbitrary data associated with timer
+     */
     public function __construct(LoopInterface $loop, $interval, callable $callback, $periodic = false, $data = null)
     {
         if ($interval < self::MIN_INTERVAL) {
@@ -27,41 +36,65 @@ public function __construct(LoopInterface $loop, $interval, callable $callback,
         $this->data = null;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getLoop()
     {
         return $this->loop;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getInterval()
     {
         return $this->interval;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getCallback()
     {
         return $this->callback;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function setData($data)
     {
         $this->data = $data;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getData()
     {
         return $this->data;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function isPeriodic()
     {
         return $this->periodic;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function isActive()
     {
         return $this->loop->isTimerActive($this);
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function cancel()
     {
         $this->loop->cancelTimer($this);
diff --git a/src/Timer/TimerInterface.php b/src/Timer/TimerInterface.php
index 5982b314..d066f369 100644
--- a/src/Timer/TimerInterface.php
+++ b/src/Timer/TimerInterface.php
@@ -2,14 +2,61 @@
 
 namespace React\EventLoop\Timer;
 
+use React\EventLoop\LoopInterface;
+
 interface TimerInterface
 {
+    /**
+     * Get the loop with which this timer is associated
+     *
+     * @return LoopInterface
+     */
     public function getLoop();
+
+    /**
+     * Get the interval after which this timer will execute, in seconds
+     *
+     * @return float
+     */
     public function getInterval();
+
+    /**
+     * Get the callback that will be executed when this timer elapses
+     *
+     * @return callable
+     */
     public function getCallback();
+
+    /**
+     * Set arbitrary data associated with timer
+     *
+     * @param mixed $data
+     */
     public function setData($data);
+
+    /**
+     * Get arbitrary data associated with timer
+     *
+     * @return mixed
+     */
     public function getData();
+
+    /**
+     * Determine whether the time is periodic
+     *
+     * @return bool
+     */
     public function isPeriodic();
+
+    /**
+     * Determine whether the time is active
+     *
+     * @return bool
+     */
     public function isActive();
+
+    /**
+     * Cancel this timer
+     */
     public function cancel();
 }
diff --git a/tests/ExtEvLoopTest.php b/tests/ExtEvLoopTest.php
new file mode 100644
index 00000000..d05dbba3
--- /dev/null
+++ b/tests/ExtEvLoopTest.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace React\Tests\EventLoop;
+
+use React\EventLoop\ExtEvLoop;
+
+class ExtEvLoopTest extends AbstractLoopTest
+{
+    private $file;
+
+    public function createLoop()
+    {
+        if (!class_exists('EvLoop')) {
+            $this->markTestSkipped('ev tests skipped because pecl/ev is not installed.');
+        }
+
+        return new ExtEvLoop();
+    }
+
+    public function tearDown()
+    {
+        if (file_exists($this->file)) {
+            unlink($this->file);
+        }
+    }
+
+    public function createStream()
+    {
+        $this->file = tempnam(sys_get_temp_dir(), 'react-');
+
+        $stream = fopen($this->file, 'r+');
+
+        return $stream;
+    }
+    
+    public function testEvConstructor()
+    {
+        $loop = new ExtEvLoop();
+    }
+}
diff --git a/tests/ExtEventLoopTest.php b/tests/ExtEventLoopTest.php
index 93408ad9..80daaf24 100644
--- a/tests/ExtEventLoopTest.php
+++ b/tests/ExtEventLoopTest.php
@@ -17,7 +17,7 @@ public function createLoop($readStreamCompatible = false)
         }
 
         $cfg = null;
-        if($readStreamCompatible) {
+        if ($readStreamCompatible) {
             $cfg = new \EventConfig();
             $cfg->requireFeatures(\EventConfig::FEATURE_FDS);
         }
diff --git a/tests/Timer/AbstractTimerTest.php b/tests/Timer/AbstractTimerTest.php
index bb26f52e..57689658 100644
--- a/tests/Timer/AbstractTimerTest.php
+++ b/tests/Timer/AbstractTimerTest.php
@@ -3,7 +3,6 @@
 namespace React\Tests\EventLoop\Timer;
 
 use React\Tests\EventLoop\TestCase;
-use React\EventLoop\Timer\Timers;
 
 abstract class AbstractTimerTest extends TestCase
 {
diff --git a/travis-init.sh b/travis-init.sh
index 63deeb85..6aca97b5 100755
--- a/travis-init.sh
+++ b/travis-init.sh
@@ -21,6 +21,18 @@ if [[ "$TRAVIS_PHP_VERSION" != "hhvm" &&
     popd
     echo "extension=libevent.so" >> "$(php -r 'echo php_ini_loaded_file();')"
 
+    # install 'pecl-ev' PHP extension
+    git clone http://bitbucket.org/osmanov/pecl-ev.git
+    # 0.2.12
+    pushd pecl-ev
+    phpize
+    ./configure
+    make
+    # make test
+    make install
+    popd
+    echo "extension=ev.so" >> "$(php -r 'echo php_ini_loaded_file();')"
+
     # install 'libev' PHP extension
     git clone --recursive https://github.com/m4rw3r/php-libev
     pushd php-libev

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