Add an example for DI

src/Console/ExampleDI.php

@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * FOSSBilling.
+ *
+ * @copyright FOSSBilling (https://www.fossbilling.org)
+ * @license   Apache-2.0
+ *
+ * Copyright FOSSBilling 2022
+ * This software may contain code previously used in the BoxBilling project.
+ * Copyright BoxBilling, Inc 2011-2021
+ *
+ * This source file is subject to the Apache-2.0 License that is bundled
+ * with this source code in the file LICENSE
+ */
+
+namespace Box\Mod\Example\Console;
+
+use Pimple\Container;
+use CristianG\PimpleConsole\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+
+class ExampleDI extends Command implements \FOSSBilling\InjectionAwareInterface
+{
+    protected ?Container $di = null;
+
+    /**
+     * @param  Container  $di
+     * @return void
+     */
+    public function setDi(Container $di): void
+    {
+        $this->di = $di;
+    }
+
+    /**
+     * @return Container|null
+     */
+    public function getDi(): ?Container
+    {
+        return $this->di;
+    }
+
+    /**
+     * @return void
+     */
+    protected function configure(): void
+    {
+        $this->setName('example:clear');
+        $this->setDescription('Clear your cache in example');
+        parent::configure();
+    }
+
+    /**
+     * @param  InputInterface  $input
+     * @param  OutputInterface  $output
+     * @return int
+     */
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $service = $this->di['mod_service']('system');
+        try {
+            $service->clearCache();
+        } catch (\Exception $e) {
+            $this->error("An error occurred: ".$e->getMessage());
+            return Command::FAILURE;
+        } finally {
+            $this->info("Successfully cleared the cache.");
+            return Command::SUCCESS;
+        }
+    }
+}