Added app and PHP version displays to the footer

src/Middleware/AppInfo.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace BitGoblin\Colossus\Middleware;
+
+use Psr\Http\Message\ServerRequestInterface as Request;
+
+class AppInfo {
+
+	protected $view;
+
+	public function __construct($view) {
+		$this->view = $view;
+	}
+
+	public function __invoke(Request $request, $handler) {
+		// add running app version
+		$composer = json_decode(file_get_contents(__DIR__ . '/../../composer.json'), true);
+		$this->view->getEnvironment()->addGlobal('APP_VERSION', $composer['version'] ?? 'unknown');
+
+		// add running PHP version
+		$this->view->getEnvironment()->addGlobal('PHP_VERSION', PHP_VERSION);
+
+		return $handler->handle($request);
+	}
+
+}