remove php 8 syntax

lib/comic-page.php

@@ -2,12 +2,12 @@
 declare(strict_types = 1);
 
 class ComicPage {
-    public int    $serial = 0;
-    public string $href = '';
-    public string $pageNo = '';
-    public string $title = '';
-    public string $imageUrl = '';
-    public int    $pubDate = 0;
+    public $serial = 0;
+    public $href = '';
+    public $pageNo = '';
+    public $title = '';
+    public $imageUrl = '';
+    public $pubDate = 0;
 
     function __construct() {}
     function __toString() {

lib/fetch-url.php

@@ -6,7 +6,7 @@ include_once('config/default.php');
 use GuzzleHttp\Client as HTTPClient;
 use PHPHtmlParser\Dom as DOM;
 
-function fetchUrl(string $url) {
+function fetchUrl($url) {
     $client = new HTTPClient();
 
     $res = $client->request(

lib/generate-feed.php

@@ -3,6 +3,10 @@ declare(strict_types = 1);
 
 include_once('config/default.php');
 
+function sortSerial($a, $b) {
+    return $a->serial < $b->serial ? 1 : -1;
+}
+
 function generateFeed($unsortedContent) {
     $loader = new \Twig\Loader\FilesystemLoader('templates/');
     $twig = new \Twig\Environment($loader, [
@@ -16,8 +20,7 @@ function generateFeed($unsortedContent) {
     $items = [];
 
     $content = $unsortedContent;
-    // Sort by date descending (newest first)
-    usort($content, fn($a, $b) => $a->serial < $b->serial ? 1 : -1);
+    usort($content, "sortSerial");
 
     foreach ($content as $page) {
         $content = $twig->render('item-content.html', [