Zero params should be passed through when routing. Fixes #2032

Author: lonnieezell

system/Router/Router.php

@@ -568,7 +568,9 @@ public function autoRoute(string $uri)
 	 */
 	protected function validateRequest(array $segments): array
 	{
-		$segments = array_filter($segments);
+		$segments = array_filter($segments, function ($segment) {
+			return ! empty($segment) || ($segment !== '0' || $segment !== 0);
+		});
 		$segments = array_values($segments);
 
 		$c                  = count($segments);

tests/system/Router/RouterTest.php

@@ -490,4 +490,23 @@ public function testTranslateURIDashesForAutoRoute()
 	}
 
 	//--------------------------------------------------------------------
+
+	/**
+	 * @see https://github.com/codeigniter4/CodeIgniter4/issues/2032
+	 */
+	public function testAutoRouteMatchesZeroParams()
+	{
+		$router = new Router($this->collection, $this->request);
+
+		$router->autoRoute('myController/someMethod/0/abc');
+
+		$this->assertEquals('MyController', $router->controllerName());
+		$this->assertEquals('someMethod', $router->methodName());
+
+		$expected = [
+			'0',
+			'abc',
+		];
+		$this->assertEquals($expected, $router->params());
+	}
 }