Use empty array instead of null as default

src/Loop/AbstractLoop.php

@@ -261,7 +261,7 @@ public function stop()
     /**
      * {@inheritdoc}
      */
-    public function queue(callable $callback, array $args = null)
+    public function queue(callable $callback, array $args = [])
     {
         $this->callableQueue->insert($callback, $args);
     }
@@ -293,15 +293,15 @@ public function await($resource, callable $callback)
     /**
      * {@inheritdoc}
      */
-    public function timer($interval, $periodic, callable $callback, array $args = null)
+    public function timer($interval, $periodic, callable $callback, array $args = [])
     {
         return $this->timerManager->create($interval, $periodic, $callback, $args);
     }
 
     /**
      * {@inheritdoc}
      */
-    public function immediate(callable $callback, array $args = null)
+    public function immediate(callable $callback, array $args = [])
     {
         return $this->immediateManager->create($callback, $args);
     }

src/Loop/Events/EventFactory.php

@@ -35,15 +35,15 @@ public function timer(
         $interval,
         $periodic,
         callable $callback,
-        array $args = null
+        array $args = []
     ) {
         return new Timer($manager, $interval, $periodic, $callback, $args);
     }
 
     /**
      * {@inheritdoc}
      */
-    public function immediate(ImmediateManagerInterface $manager, callable $callback, array $args = null)
+    public function immediate(ImmediateManagerInterface $manager, callable $callback, array $args = [])
     {
         return new Immediate($manager, $callback, $args);
     }

src/Loop/Events/EventFactoryInterface.php

@@ -30,7 +30,7 @@ public function socket(SocketManagerInterface $manager, $resource, callable $cal
      * @param int|float $interval Timer interval.
      * @param bool $periodic Set to true to repeat the timer every interval seconds, false for a one-time timer.
      * @param callable $callback Callback function invoked after the interval elapses.
-     * @param mixed[]|null $args Arguments to pass to the callback function.
+     * @param mixed[] $args Arguments to pass to the callback function.
      *
      * @return \Icicle\Loop\Events\TimerInterface
      */
@@ -39,17 +39,17 @@ public function timer(
         $interval,
         $periodic,
         callable $callback,
-        array $args = null
+        array $args = []
     );
 
     /**
      * @param \Icicle\Loop\Manager\ImmediateManagerInterface $manager
      * @param callable $callback Callback function to be invoked.
-     * @param mixed[]|null $args Arguments to pass to the callback function.
+     * @param mixed[] $args Arguments to pass to the callback function.
      *
      * @return \Icicle\Loop\Events\ImmediateInterface
      */
-    public function immediate(ImmediateManagerInterface $manager, callable $callback, array $args = null);
+    public function immediate(ImmediateManagerInterface $manager, callable $callback, array $args = []);
 
     /**
      * @param \Icicle\Loop\Manager\SignalManagerInterface $manager

src/Loop/Events/Immediate.php

@@ -31,9 +31,9 @@ class Immediate implements ImmediateInterface
     /**
      * @param \Icicle\Loop\Manager\ImmediateManagerInterface $manager
      * @param callable $callback Function called when the interval expires.
-     * @param array $args Optional array of arguments to pass the callback function.
+     * @param mixed[] $args Optional array of arguments to pass the callback function.
      */
-    public function __construct(ImmediateManagerInterface $manager, callable $callback, array $args = null)
+    public function __construct(ImmediateManagerInterface $manager, callable $callback, array $args = [])
     {
         $this->manager = $manager;
         $this->callback = $callback;

src/Loop/Events/Timer.php

@@ -51,14 +51,14 @@ class Timer implements TimerInterface
      * @param int|float $interval Number of seconds until the callback function is called.
      * @param bool $periodic True to repeat the timer, false to only run it once.
      * @param callable $callback Function called when the interval expires.
-     * @param mixed[]|null $args Optional array of arguments to pass the callback function.
+     * @param mixed[] $args Optional array of arguments to pass the callback function.
      */
     public function __construct(
         TimerManagerInterface $manager,
         $interval,
         $periodic,
         callable $callback,
-        array $args = null
+        array $args = []
     ) {
         $this->manager = $manager;
         $this->interval = (float) $interval;

src/Loop/LoopInterface.php

@@ -80,9 +80,9 @@ public function maxQueueDepth($depth);
      * Callbacks are called in the order queued.
      *
      * @param callable<(mixed ...$args): void> $callback
-     * @param mixed[]|null $args Array of arguments to be passed to the callback function.
+     * @param mixed[] $args Array of arguments to be passed to the callback function.
      */
-    public function queue(callable $callback, array $args = null);
+    public function queue(callable $callback, array $args = []);
 
     /**
      * Creates an event object that can be used to listen for available data on the stream socket.
@@ -114,21 +114,21 @@ public function await($resource, callable $callback);
      * @param int|float $interval
      * @param bool $periodic
      * @param callable<(mixed ...$args): void> $callback
-     * @param mixed[]|null $args
+     * @param mixed[] $args
      *
      * @return \Icicle\Loop\Events\TimerInterface
      */
-    public function timer($interval, $periodic, callable $callback, array $args = null);
+    public function timer($interval, $periodic, callable $callback, array $args = []);
 
     /**
      * Creates an immediate object connected to the loop.
      *
      * @param callable<(mixed ...$args): void> $callback
-     * @param mixed[]|null $args
+     * @param mixed[] $args
      *
      * @return \Icicle\Loop\Events\ImmediateInterface
      */
-    public function immediate(callable $callback, array $args = null);
+    public function immediate(callable $callback, array $args = []);
 
     /**
      * @param int $signo

src/Loop/Manager/AbstractSignalManager.php

@@ -48,7 +48,7 @@ public function __construct(LoopInterface $loop, EventFactoryInterface $factory)
     /**
      * {@inheritdoc}
      */
-    public function create($signo, callable $callback, array $args = null)
+    public function create($signo, callable $callback, array $args = [])
     {
         if (!isset($this->signals[$signo])) {
             throw new InvalidSignalError(sprintf('Invalid signal number: %d.', $signo));

src/Loop/Manager/Event/TimerManager.php

@@ -89,7 +89,7 @@ public function isEmpty()
     /**
      * {@inheritdoc}
      */
-    public function create($interval, $periodic, callable $callback, array $args = null)
+    public function create($interval, $periodic, callable $callback, array $args = [])
     {
         $timer = $this->factory->timer($this, $interval, $periodic, $callback, $args);
 

src/Loop/Manager/ImmediateManager.php

@@ -50,7 +50,7 @@ public function __construct(LoopInterface $loop, EventFactoryInterface $factory)
     /**
      * {@inheritdoc}
      */
-    public function create(callable $callback, array $args = null)
+    public function create(callable $callback, array $args = [])
     {
         $immediate = $this->factory->immediate($this, $callback, $args);
 

src/Loop/Manager/ImmediateManagerInterface.php

@@ -21,7 +21,7 @@ interface ImmediateManagerInterface
      *
      * @return \Icicle\Loop\Events\ImmediateInterface
      */
-    public function create(callable $callback, array $args = null);
+    public function create(callable $callback, array $args = []);
 
     /**
      * Puts the immediate in the loop again for execution.

src/Loop/Manager/Libevent/TimerManager.php

@@ -94,7 +94,7 @@ public function isEmpty()
     /**
      * {@inheritdoc}
      */
-    public function create($interval, $periodic, callable $callback, array $args = null)
+    public function create($interval, $periodic, callable $callback, array $args = [])
     {
         $timer = $this->factory->timer($this, $interval, $periodic, $callback, $args);
 

src/Loop/Manager/Select/TimerManager.php

@@ -54,7 +54,7 @@ public function __construct(SelectLoop $loop, EventFactoryInterface $factory)
     /**
      * {@inheritdoc}
      */
-    public function create($interval, $periodic, callable $callback, array $args = null)
+    public function create($interval, $periodic, callable $callback, array $args = [])
     {
         $timer = $this->factory->timer($this, $interval, $periodic, $callback, $args);
 

src/Loop/Manager/SignalManagerInterface.php

@@ -22,7 +22,7 @@ interface SignalManagerInterface
      *
      * @return \Icicle\Loop\Events\SignalInterface
      */
-    public function create($signo, callable $callback, array $args = null);
+    public function create($signo, callable $callback, array $args = []);
 
     /**
      * Enables listening for the signal.

src/Loop/Manager/TimerManagerInterface.php

@@ -23,7 +23,7 @@ interface TimerManagerInterface
      *
      * @return \Icicle\Loop\Events\TimerInterface
      */
-    public function create($interval, $periodic, callable $callback, array $args = null);
+    public function create($interval, $periodic, callable $callback, array $args = []);
 
     /**
      * Starts the given timer if it is not already pending.

src/Loop/Structures/CallableQueue.php

@@ -37,9 +37,9 @@ public function __construct($depth = 0)
 
     /**
      * @param callable $callback
-     * @param mixed[]|null $args
+     * @param mixed[] $args
      */
-    public function insert(callable $callback, array $args = null)
+    public function insert(callable $callback, array $args = [])
     {
         $this->queue[] = [$callback, $args];
     }

tests/Loop/Events/ImmediateTest.php

@@ -22,7 +22,7 @@ public function setUp()
         $this->manager = $this->getMock(ImmediateManagerInterface::class);
     }
 
-    public function createImmediate(callable $callback, array $args = null)
+    public function createImmediate(callable $callback, array $args = [])
     {
         return new Immediate($this->manager, $callback, $args);
     }

tests/Loop/Events/TimerTest.php

@@ -24,7 +24,7 @@ public function setUp()
         $this->manager = $this->getMock(TimerManagerInterface::class);
     }
 
-    public function createTimer($interval, $periodic, callable $callback, array $args = null)
+    public function createTimer($interval, $periodic, callable $callback, array $args = [])
     {
         return new Timer($this->manager, $interval, $periodic, $callback, $args);
     }