Update documentation and minor cleanup

README.md

@@ -65,6 +65,10 @@ to pause, or by accident in case of a network issue or server outage.
 Pull the package via composer.
 ```shell
 $ composer require ankitpokhrel/tus-php
+
+// Use symfony-5 branch for Symfony 5+
+
+$ composer require ankitpokhrel/tus-php:dev-symfony-5
 ```
 
 ### Usage
@@ -78,7 +82,7 @@ This is how a simple server looks like.
 ```php
 // server.php
 
-$server   = new \TusPhp\Tus\Server('redis'); // Leave empty for file based cache
+$server   = new \TusPhp\Tus\Server('redis'); // Either redis, file or apcu. Leave empty for file based cache.
 $response = $server->serve();
 
 $response->send();
@@ -249,7 +253,7 @@ Usage:
   tus:expired [<cache-adapter>] [options]
 
 Arguments:
-  cache-adapter         Cache adapter to use, redis or file. Optional, defaults to file based cache. [default: "file"]
+  cache-adapter         Cache adapter to use: redis, file or apcu [default: "file"]
 
 Options:
   -c, --config=CONFIG   File to get config parameters from.

composer.json

@@ -21,6 +21,7 @@
     "symfony/http-foundation": "^3.4.11 || ^4.0"
   },
   "require-dev": {
+    "ext-apcu": "*",
     "ext-pcntl": "*",
     "friendsofphp/php-cs-fixer": "^2.9",
     "mockery/mockery": "^1.3.0",

src/Cache/ApcuStore.php

@@ -7,7 +7,6 @@
 
 class ApcuStore extends AbstractCache
 {
-
     /**
      * {@inheritDoc}
      */
@@ -58,6 +57,7 @@ public function delete(string $key): bool
     public function keys(): array
     {
         $iterator = new APCUIterator('/^' . preg_quote($this->getPrefix()) . '.*$/', APC_ITER_KEY);
+
         return array_column(iterator_to_array($iterator, false), 'key');
     }
 

src/Commands/ExpirationCommand.php

@@ -23,11 +23,11 @@ protected function configure()
         $this
             ->setName('tus:expired')
             ->setDescription('Remove expired uploads.')
-            ->setHelp('Deletes all expired uploads to free server resources. Values can be redis or file. Defaults to file.')
+            ->setHelp('Deletes all expired uploads to free server resources. Values can be redis, file or apcu. Defaults to file.')
             ->addArgument(
                 'cache-adapter',
                 InputArgument::OPTIONAL,
-                'Cache adapter to use, redis or file. Optional, defaults to file based cache.',
+                'Cache adapter to use: redis, file or apcu',
                 'file'
             )
             ->addOption(

tests/Cache/ApcuStoreTest.php

@@ -2,7 +2,6 @@
 
 namespace TusPhp\Test\Cache;
 
-use Exception;
 use TusPhp\Cache\ApcuStore;
 use PHPUnit\Framework\TestCase;
 
@@ -11,13 +10,13 @@
  */
 class ApcuStoreTest extends TestCase
 {
-
     /** @var boolean */
     protected static $extensionLoaded;
 
     /** @var ApcuStore */
     protected static $store;
-
+
+    /** @var string */
     protected $checksum = '74f02d6da32082463e382f2274e85fd8eae3e81f739f8959abc91865656e3b3a';
 
     /**