diff --git a/.travis.yml b/.travis.yml
index f02f6a3ac..2ef231296 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,12 +13,14 @@ php:
 
 before_script:
   - if [[ "$TRAVIS_PHP_VERSION" == '5.6' ]]; then composer require satooshi/php-coveralls:1.* squizlabs/php_codesniffer:2.* -n ; fi
+  - if [[ "$TRAVIS_PHP_VERSION" == '7.1' ]]; then composer require phpstan/phpstan:^0.10.3 -n ; fi
   - if [[ "$TRAVIS_PHP_VERSION" != '5.6' ]]; then composer install -n ; fi
 
 script:
   - if [[ "$TRAVIS_PHP_VERSION" == '5.6' ]]; then vendor/bin/phpunit --coverage-clover clover.xml ; fi
   - if [[ "$TRAVIS_PHP_VERSION" != '5.6' ]]; then vendor/bin/phpunit ; fi
   - if [[ "$TRAVIS_PHP_VERSION" == '5.6' ]]; then vendor/bin/phpcs ; fi
+  - if [[ "$TRAVIS_PHP_VERSION" == '7.1' ]]; then vendor/bin/phpstan analyse Slim -l 1 || true ; fi
 
 after_script:
   - if [[ "$TRAVIS_PHP_VERSION" == '5.6' ]]; then php vendor/bin/coveralls --coverage_clover=clover.xml -v ; fi
diff --git a/Slim/Container.php b/Slim/Container.php
index 1f713ac4e..8d7cefe26 100644
--- a/Slim/Container.php
+++ b/Slim/Container.php
@@ -31,16 +31,16 @@
  *  - notAllowedHandler: a callable with the signature: function($request, $response, $allowedHttpMethods)
  *  - callableResolver: an instance of \Slim\Interfaces\CallableResolverInterface
  *
- * @property-read array settings
- * @property-read \Slim\Interfaces\Http\EnvironmentInterface environment
- * @property-read \Psr\Http\Message\ServerRequestInterface request
- * @property-read \Psr\Http\Message\ResponseInterface response
- * @property-read \Slim\Interfaces\RouterInterface router
- * @property-read \Slim\Interfaces\InvocationStrategyInterface foundHandler
- * @property-read callable errorHandler
- * @property-read callable notFoundHandler
- * @property-read callable notAllowedHandler
- * @property-read \Slim\Interfaces\CallableResolverInterface callableResolver
+ * @property-read array $settings
+ * @property-read \Slim\Interfaces\Http\EnvironmentInterface $environment
+ * @property-read \Psr\Http\Message\ServerRequestInterface $request
+ * @property-read \Psr\Http\Message\ResponseInterface $response
+ * @property-read \Slim\Interfaces\RouterInterface $router
+ * @property-read \Slim\Interfaces\InvocationStrategyInterface $foundHandler
+ * @property-read callable $errorHandler
+ * @property-read callable $notFoundHandler
+ * @property-read callable $notAllowedHandler
+ * @property-read \Slim\Interfaces\CallableResolverInterface $callableResolver
  */
 class Container extends PimpleContainer implements ContainerInterface
 {
diff --git a/Slim/Handlers/AbstractError.php b/Slim/Handlers/AbstractError.php
index 42f8dde3d..90bdcdef3 100644
--- a/Slim/Handlers/AbstractError.php
+++ b/Slim/Handlers/AbstractError.php
@@ -90,7 +90,7 @@ protected function renderThrowableAsText($throwable)
     /**
      * Wraps the error_log function so that this can be easily tested
      *
-     * @param $message
+     * @param string $message
      */
     protected function logError($message)
     {
diff --git a/Slim/Interfaces/RouterInterface.php b/Slim/Interfaces/RouterInterface.php
index 2ab8b678f..4803c128c 100644
--- a/Slim/Interfaces/RouterInterface.php
+++ b/Slim/Interfaces/RouterInterface.php
@@ -75,7 +75,7 @@ public function popGroup();
     public function getNamedRoute($name);
 
     /**
-     * @param $identifier
+     * @param string $identifier
      *
      * @return \Slim\Interfaces\RouteInterface
      */
diff --git a/Slim/Router.php b/Slim/Router.php
index 83116288c..491727024 100644
--- a/Slim/Router.php
+++ b/Slim/Router.php
@@ -167,8 +167,9 @@ public function map($methods, $pattern, $handler)
         // According to RFC methods are defined in uppercase (See RFC 7231)
         $methods = array_map("strtoupper", $methods);
 
-        // Add route
+        /** @var \Slim\Route */
         $route = $this->createRoute($methods, $pattern, $handler);
+        // Add route
         $this->routes[$route->getIdentifier()] = $route;
         $this->routeCounter++;
 
@@ -335,7 +336,8 @@ public function popGroup()
     }
 
     /**
-     * @param $identifier
+     *
+     * @param string $identifier
      * @return \Slim\Interfaces\RouteInterface
      */
     public function lookupRoute($identifier)
@@ -371,6 +373,7 @@ public function relativePathFor($name, array $data = [], array $queryParams = []
         $routeDatas = array_reverse($routeDatas);
 
         $segments = [];
+        $segmentName = '';
         foreach ($routeDatas as $routeData) {
             foreach ($routeData as $item) {
                 if (is_string($item)) {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 000000000..8006892a0
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,4 @@
+parameters:
+    ignoreErrors:
+#        - '#Parameter \$to of method Slim\\App::redirect\(\) has invalid typehint type Slim\\UriInterface#'
+#        - '#Variable \$_FILES in isset\(\) always exists and is not nullable#'