Use getTitlesLineage() to check if page exists

router.php

@@ -28,33 +28,25 @@ define("PAGE", basename(PAGE_ADDRESS, '.php'));
 
 require "pages.php";
 
-if (PAGE !== 'index') {
-	if (!isset(TITLES[SERVICE][PAGE])) {
-		http_response_code(404);
-		exit('Page not found.');
-	}
-	if (SERVICE !== '.') {
-		if (!isset(TITLES[SERVICE]['index'])) {
-			http_response_code(404);
-			exit('Page not found.');
-		}
-	}
-}
-
 function getTitlesLineage($titles, $pageElements) {
 	if (!isset($titles['index']) OR $pageElements[0] === 'index')
-		return [$titles[$pageElements[0]]];
+		return [$titles[$pageElements[0]] ?? false];
 	$result = $titles['index'];
 	if (!isset($pageElements[1]))
 		unset($titles['index']);
 	else
-		$titles = $titles[array_shift($pageElements)];
+		$titles = $titles[array_shift($pageElements)] ?? false;
 	$results = getTitlesLineage($titles, $pageElements);
 	$results[] = $result;
 	return $results;
 }
 define('TITLES_LINEAGE', array_reverse(getTitlesLineage(TITLES, PAGE_LINEAGE)));
 
+if (!TITLES_LINEAGE[array_key_last(TITLES_LINEAGE)]) {
+	http_response_code(404);
+	exit('Page not found.');
+}
+
 if (
 		isset($_COOKIE['niver-session-key']) // Resume session
 	OR