Downgrade to PHP 7.0

Because wp.org svn pre-commit hook rejects PHP 7.1 syntax.

.travis.yml

@@ -45,5 +45,7 @@ jobs:
       after_success: bash <(curl -s https://codecov.io/bash) -s "$TRAVIS_BUILD_DIR/tests/_output/"
     - stage: test
       php: 7.1
+    - stage: test
+      php: 7.0
     - stage: test
       php: nightly

README.md

@@ -101,7 +101,7 @@ add_filter('the_content', [$foo, 'filterSomething'])
 In WordPress plus container, the above is similar to:
 
 ```php
-add_action('admin_init', function ($arg) use ($container): void {
+add_action('admin_init', function ($arg) use ($container) {
   $bar = $container->get('bar');
   $bar->doSomething($arg);
 })

composer.json

@@ -29,7 +29,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.0",
         "psr/container": "^1.0",
         "psr/container-implementation": "^1.0"
     },

src/ContainerAwareInterface.php

@@ -16,7 +16,7 @@ interface ContainerAwareInterface
      *
      * @return void
      */
-    public function setContainer(ContainerInterface $container): void;
+    public function setContainer(ContainerInterface $container);
 
     /**
      * Get the container.

src/ContainerAwareTrait.php

@@ -39,7 +39,7 @@ public function getContainer(): ContainerInterface
      *
      * @return void
      */
-    public function setContainer(ContainerInterface $container): void
+    public function setContainer(ContainerInterface $container)
     {
         $this->container = $container;
     }

src/Hooks/AbstractHook.php

@@ -48,24 +48,24 @@ abstract class AbstractHook implements HookInterface
     /**
      * Filter constructor.
      *
-     * @param string   $hook            The name of the WordPress hook that is being registered.
-     * @param string   $classIdentifier Identifier of the entry to look for from container.
-     * @param string   $callbackMethod  The callback method name.
-     * @param int|null $priority        Optional.The priority at which the function should be fired. Default is 10.
-     * @param int|null $acceptedArgs    Optional. The number of arguments that should be passed to the $callback.
-     *                                  Default is 1.
+     * @param string $hook            The name of the WordPress hook that is being registered.
+     * @param string $classIdentifier Identifier of the entry to look for from container.
+     * @param string $callbackMethod  The callback method name.
+     * @param int    $priority        Optional.The priority at which the function should be fired. Default is 10.
+     * @param int    $acceptedArgs    Optional. The number of arguments that should be passed to the $callback.
+     *                                Default is 1.
      */
     public function __construct(
         string $hook,
         string $classIdentifier,
         string $callbackMethod,
-        ?int $priority = null,
-        ?int $acceptedArgs = null
+        $priority = null,
+        $acceptedArgs = null
     ) {
         $this->hook = $hook;
         $this->classIdentifier = $classIdentifier;
         $this->callbackMethod = $callbackMethod;
-        $this->priority = $priority ?? 10;
-        $this->acceptedArgs = $acceptedArgs ?? 1;
+        $this->priority = (int) ($priority ?? 10);
+        $this->acceptedArgs = (int) ($acceptedArgs ?? 1);
     }
 }

src/Hooks/Action.php

@@ -9,7 +9,7 @@ class Action extends AbstractHook
     /**
      * {@inheritdoc}
      */
-    public function register(): void
+    public function register()
     {
         add_action(
             $this->hook,
@@ -26,7 +26,7 @@ public function register(): void
      *
      * @return void
      */
-    public function run(...$args): void
+    public function run(...$args)
     {
         $container = $this->getContainer();
         $instance = $container->get($this->classIdentifier);

src/Hooks/Filter.php

@@ -9,7 +9,7 @@ class Filter extends AbstractHook
     /**
      * {@inheritdoc}
      */
-    public function register(): void
+    public function register()
     {
         add_filter(
             $this->hook,

src/Hooks/HookInterface.php

@@ -17,7 +17,7 @@ interface HookInterface extends ContainerAwareInterface
      *
      * @return void
      */
-    public function register(): void;
+    public function register();
 
     /**
      * The actual callback that WordPress going to fire.

src/Loader.php

@@ -42,7 +42,7 @@ public function __construct(ContainerInterface $container)
      *
      * @return void
      */
-    public function add(HookInterface ...$hooks): void
+    public function add(HookInterface ...$hooks)
     {
         $this->hooks = array_values(
             array_unique(
@@ -57,7 +57,7 @@ public function add(HookInterface ...$hooks): void
      *
      * @return void
      */
-    public function run(): void
+    public function run()
     {
         foreach ($this->hooks as $hook) {
             $hook->setContainer($this->container);