3 files changed, 9 insertions, 63 deletions
diff --git a/lib/BridgeAbstract.php b/lib/BridgeAbstract.php
index 537e76df..21206a7b 100644
--- a/lib/BridgeAbstract.php
+++ b/lib/BridgeAbstract.php
@@ -410,11 +410,10 @@ abstract class BridgeAbstract implements BridgeInterface
     /**
      * Loads a cached value for the specified key
      *
-     * @param string $key Key name
      * @param int $duration Cache duration (optional)
      * @return mixed Cached value or null if the key doesn't exist or has expired
      */
-    protected function loadCacheValue($key, $duration = null)
+    protected function loadCacheValue(string $key, $duration = null)
     {
         $cacheFactory = new CacheFactory();
 
@@ -422,7 +421,7 @@ abstract class BridgeAbstract implements BridgeInterface
         // Create class name without the namespace part
         $scope = $this->getShortName();
         $cache->setScope($scope);
-        $cache->setKey($key);
+        $cache->setKey([$key]);
         $timestamp = $cache->getTime();
 
         if (
@@ -438,17 +437,16 @@ abstract class BridgeAbstract implements BridgeInterface
     /**
      * Stores a value to cache with the specified key
      *
-     * @param string $key Key name
      * @param mixed $value Value to cache
      */
-    protected function saveCacheValue($key, $value)
+    protected function saveCacheValue(string $key, $value)
     {
         $cacheFactory = new CacheFactory();
 
         $cache = $cacheFactory->create();
         $scope = $this->getShortName();
         $cache->setScope($scope);
-        $cache->setKey($key);
+        $cache->setKey([$key]);
         $cache->saveData($value);
     }
 
diff --git a/lib/CacheInterface.php b/lib/CacheInterface.php
index b332e21b..414a9c84 100644
--- a/lib/CacheInterface.php
+++ b/lib/CacheInterface.php
@@ -1,68 +1,16 @@
 <?php
 
-/**
- * This file is part of RSS-Bridge, a PHP project capable of generating RSS and
- * Atom feeds for websites that don't have one.
- *
- * For the full license information, please view the UNLICENSE file distributed
- * with this source code.
- *
- * @package Core
- * @license http://unlicense.org/ UNLICENSE
- * @link    https://github.com/rss-bridge/rss-bridge
- */
-
-/**
- * The cache interface
- */
 interface CacheInterface
 {
-    /**
-     * Set scope of the current cache
-     *
-     * If $scope is an empty string, the cache is set to a global context.
-     *
-     * @param string $scope The scope the data is related to
-     */
-    public function setScope($scope);
+    public function setScope(string $scope): void;
 
-    /**
-     * Set key to assign the current data
-     *
-     * Since $key can be anything, the cache implementation must ensure to
-     * assign the related data reliably; most commonly by serializing and
-     * hashing the key in an appropriate way.
-     *
-     * @param array $key The key the data is related to
-     */
-    public function setKey($key);
+    public function setKey(array $key): void;
 
-    /**
-     * Loads data from cache
-     *
-     * @return mixed The cached data or null
-     */
     public function loadData();
 
-    /**
-     * Stores data to the cache
-     *
-     * @param mixed $data The data to store
-     * @return self The cache object
-     */
-    public function saveData($data);
+    public function saveData($data): void;
 
-    /**
-     * Returns the modification time of the current cache item.
-     * In unix timestamp.
-     * Example: 1688570578
-     */
     public function getTime(): ?int;
 
-    /**
-     * Removes any data that is older than the specified age from cache
-     *
-     * @param int $seconds The cache age in seconds
-     */
-    public function purgeCache($seconds);
+    public function purgeCache(int $seconds): void;
 }
diff --git a/lib/contents.php b/lib/contents.php
index 568d5b92..20e30025 100644
--- a/lib/contents.php
+++ b/lib/contents.php
@@ -103,7 +103,7 @@ function getContents(
 
     $cache = $cacheFactory->create();
     $cache->setScope('server');
-    $cache->purgeCache(86400); // 24 hours (forced)
+    $cache->purgeCache(86400);
     $cache->setKey([$url]);
 
     // Snagged from https://github.com/lwthiker/curl-impersonate/blob/main/firefox/curl_ff102