diff --git a/content/search-results.php b/content/search-results.php
index 85ed579..25b96be 100644
--- a/content/search-results.php
+++ b/content/search-results.php
@@ -64,8 +64,8 @@ $resultCount = count($results);
                         <span>Alphabetisch</span>
                     </label>
                     <label class="s-res-filter-option">
-                        <input type="radio" name="sort" value="likes" class="sort-radio" <?php echo $currentSort === 'likes' ? 'checked' : ''; ?>>
-                        <span>Beliebtheit</span>
+                        <input type="radio" name="sort" value="likes" <?php echo $currentSort === 'likes' ? 'checked' : ''; ?> onchange="this.form.submit()">
+                        <span>Beliebtheit (Likes)</span>
                     </label>
                     <label class="s-res-filter-option">
                         <input type="radio" name="sort" value="newest" class="sort-radio" <?php echo $currentSort === 'newest' ? 'checked' : ''; ?>>
@@ -135,8 +135,14 @@ $resultCount = count($results);
                                     <?php echo htmlspecialchars($item['title']); ?>
                                 </a>
                             </h2>
-                            <p class="s-res-author">Von: <span class="s-res-author-name"><?php echo htmlspecialchars($item['author']); ?></span></p>
-                            <p style="font-size: 0.8rem; color: #3b82f6; margin-top: 2px;">Kategorie: <?php echo htmlspecialchars($item['category'] ?? 'Allgemein'); ?></p>
+                            <div class="s-res-meta-row">
+                                <p class="s-res-author">Von: <span class="s-res-author-name"><?php echo htmlspecialchars($item['author']); ?></span></p>
+
+                                <span class="s-res-likes">
+                                    ❤️ <?php echo isset($item['likes']) && is_array($item['likes']) ? count($item['likes']) : 0; ?>
+                                </span>
+                            </div>
+
                         </div>
                         <div class="s-res-arrow">&rarr;</div>
                     </div>
diff --git a/content/showArticle.php b/content/showArticle.php
index d461d16..cd01df6 100644
--- a/content/showArticle.php
+++ b/content/showArticle.php
@@ -1,28 +1,10 @@
 <?php
-include_once 'php/controller/showArticle-controller.php';
-require_once 'php/model/CommentManager.php';
-
 $comments = [];
 $mainComments = [];
 $repliesByParent = [];
+$articleObj = null;
 
-if (isset($_GET["id"])) {
-    try {
-        $commentManager = CommentManager::getInstance();
-        $comments = $commentManager->getCommentsByArticle($_GET["id"]);
-
-        foreach ($comments as $comment) {
-            if ($comment->isReply()) {
-                $parentId = $comment->getParentCommentId();
-                $repliesByParent[$parentId][] = $comment;
-            } else {
-                $mainComments[] = $comment;
-            }
-        }
-    } catch (Exception $e) {
-        $_SESSION["message"] = "internal_error";
-    }
-}
+include_once 'php/controller/showArticle-controller.php';
 ?>
 <!--
      Seite: Anzeige für Beiträge
@@ -35,9 +17,28 @@ if (isset($_GET["id"])) {
     <!-- Metadaten & Titel -->
     <div class="article-view-top-section">
 
-        <?php if (isset($category) && !empty($category)): ?>
-            <span class="article-view-category"><?php echo htmlspecialchars($category); ?></span>
-        <?php endif; ?>
+        <div class="article-view-top-section">
+
+            <div class="category-and-likes-row">
+                <?php if (isset($category) && !empty($category)): ?>
+                    <span class="article-view-category"><?php echo htmlspecialchars($category); ?></span>
+                <?php endif; ?>
+
+                <!-- Like-Anzeige und dynamischer Like-Button  -->
+                <?php if (isset($articleObj) && $articleObj !== null): ?>
+                    <div class="article-view-likes">
+                        <span>❤️ <span class="like-count"><?php echo $articleObj->getLikeCount(); ?></span></span>
+
+                        <?php if (isset($_SESSION["user_email"])): ?>
+                            <a href="php/controller/like-controller.php?id=<?php echo $articleObj->getId(); ?>" class="like-toggle-btn">
+                                <?php echo $articleObj->hasLiked($_SESSION["user_email"]) ? '👎 Gefällt mir nicht mehr' : '👍 Gefällt mir'; ?>
+                            </a>
+                        <?php else: ?>
+                            <span class="login-hint">(Anmelden zum Liken)</span>
+                        <?php endif; ?>
+                    </div>
+                <?php endif; ?>
+            </div>
 
         <h1 class="article-view-title">
             <?php if (isset($title)) { echo htmlspecialchars($title); } ?>
diff --git a/css/search-results.css b/css/search-results.css
index 4fc5d97..a89817c 100644
--- a/css/search-results.css
+++ b/css/search-results.css
@@ -247,6 +247,17 @@ CSS für die Suchergebnis-Seite
     cursor: not-allowed;
 }
 
+.s-res-meta-row {
+    display: flex;
+    gap: 15px;
+    align-items: center;
+}
+
+.s-res-likes {
+    font-size: 0.9em;
+    color: #475569;
+}
+
 /* Responsive Anpassungen unter 760px (für z.B. Smartphones) */
 @media (max-width: 768px) {
     .s-res-layout-grid {
diff --git a/css/showArticle.css b/css/showArticle.css
index 46ffbad..ec801d5 100644
--- a/css/showArticle.css
+++ b/css/showArticle.css
@@ -239,4 +239,48 @@
 
 .comment-login-hint p {
     margin-bottom: 1rem;
+}
+
+/*
+Like-Button etc.
+ */
+
+.category-and-likes-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 10px;
+}
+
+.article-view-likes {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    font-size: 0.95em;
+}
+
+.article-view-likes .like-count {
+    font-weight: bold;
+}
+
+.article-view-likes .login-hint {
+    font-size: 0.8em;
+    color: #777;
+}
+
+/* Interaktiver Like/Unlike-Button */
+.like-toggle-btn {
+    text-decoration: none;
+    padding: 4px 10px;
+    border: 1px solid #bbb;
+    border-radius: 4px;
+    background-color: #f5f5f5;
+    color: #333;
+    font-weight: 500;
+    transition: background-color 0.2s ease, border-color 0.2s ease;
+}
+
+.like-toggle-btn:hover {
+    background-color: #eaeaea;
+    border-color: #999;
 }
\ No newline at end of file
diff --git a/php/controller/like-controller.php b/php/controller/like-controller.php
new file mode 100644
index 0000000..d0d9a95
--- /dev/null
+++ b/php/controller/like-controller.php
@@ -0,0 +1,42 @@
+<?php
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
+
+require_once __DIR__ . '/../model/Article.php';
+require_once __DIR__ . '/../model/ArticleManager.php';
+
+// 2. Prüfen, ob eine gültige Artikel-ID übergeben wurde
+if (isset($_GET["id"]) && !empty($_GET["id"])) {
+    $articleId = intval($_GET["id"]);
+    $userEmail = $_SESSION["user_email"];
+
+    if (!isset($_SESSION["user_email"]) || empty($_SESSION["user_email"])) {
+        $_SESSION["message"] = "unauthorized_access";
+        header("Location: ../../index.php?pfad=showArticle&id=" . $articleId);
+        exit();
+    }
+
+    try {
+        $articleManager = ArticleManager::getInstance();
+        $articleManager->toggleLike($articleId, $userEmail);
+
+        header("Location: ../../index.php?pfad=showArticle&id=" . $articleId);
+        exit();
+
+    } catch (NotFoundException $e) {
+        $_SESSION["message"] = "missing_id";
+        header("Location: ../../index.php");
+        exit();
+    } catch (Exception $e) {
+        $_SESSION["message"] = "internal_error";
+        header("Location: ../../index.php");
+        exit();
+    }
+} else {
+    $_SESSION["message"] = "missing_id";
+    header("Location: ../../index.php");
+    exit();
+}
+
+?>
\ No newline at end of file
diff --git a/php/controller/search-results-controller.php b/php/controller/search-results-controller.php
index d4546e6..9907a69 100644
--- a/php/controller/search-results-controller.php
+++ b/php/controller/search-results-controller.php
@@ -26,18 +26,22 @@ if ($_SERVER["REQUEST_METHOD"] === "GET" && isset($_GET["q"])) {
 
             if ($sortStyle === 'alphabet') {
                 // Titel aufsteigend alphabetiisch sortiert
+                usort($results, function ($a, $b) {
+                    return strcasecmp($a->getTitle(), $b->getTitle());
+                });
+            } elseif ($sortStyle === 'likes') {
                 usort($results, function($a, $b) {
-                    return strcasecmp($a->title, $b->title);
+                    return $b->getLikeCount() <=> $a->getLikeCount();
                 });
             } elseif ($sortStyle === 'newest') {
                 // Datum neu zu alt sortiert
                 usort($results, function($a, $b) {
-                    return strcmp($b->creationDate, $a->creationDate);
+                    return strcmp($b->getCreationDate(), $a->getCreationDate());
                 });
             } elseif ($sortStyle === 'oldest') {
                 // Datum alt zu neu sortiert
                 usort($results, function($a, $b) {
-                    return strcmp($a->creationDate, $b->creationDate);
+                    return strcmp($a->getCreationDate(), $b->getCreationDate());
                 });
             }
 
@@ -45,14 +49,14 @@ if ($_SERVER["REQUEST_METHOD"] === "GET" && isset($_GET["q"])) {
             $safeArrayResults = [];
             foreach ($results as $obj) {
                 $safeArrayResults[] = [
-                    "id" => $obj->id,
-                    "title" => $obj->title,
-                    "content" => $obj->content,
-                    "author" => $obj->author,
-                    "category" => $obj->category,
-                    "tags" => $obj->tags,
-                    "creationDate" => $obj->creationDate
-                    //"likes" => $obj->likes
+                    "id" => $obj->getId(),
+                    "title" => $obj->getTitle(),
+                    "content" => $obj->getContent(),
+                    "author" => $obj->getAuthor(),
+                    "category" => $obj->getCategory(),
+                    "tags" => $obj->getTags(),
+                    "creationDate" => $obj->getCreationDate(),
+                    "likes" => $obj->getLikes(),
                 ];
             }
             
diff --git a/php/controller/showArticle-controller.php b/php/controller/showArticle-controller.php
index cff0483..6e140f9 100644
--- a/php/controller/showArticle-controller.php
+++ b/php/controller/showArticle-controller.php
@@ -5,6 +5,7 @@ if (session_status() === PHP_SESSION_NONE) {
 
 require_once 'php/model/Article.php';
 require_once 'php/model/ArticleManager.php';
+require_once 'php/model/CommentManager.php';
 
 if (isset($_GET["id"]) && !empty($_GET["id"])){
     try {
@@ -17,11 +18,25 @@ if (isset($_GET["id"]) && !empty($_GET["id"])){
             $category = $article->getCategory();
             $author = $article->getAuthor();
             $tags = $article->getTags();
+            $articleObj = $article; // Objekt für die Like-Abfagen sichern
         }else{
             //header("location: index.php?pfad=404");
             include_once "content/404.php";
             exit();
         }
+
+        $commentManager = CommentManager::getInstance();
+        $comments = $commentManager->getCommentsByArticle($_GET["id"]);
+
+        foreach ($comments as $comment) {
+            if ($comment->isReply()) {
+                $parentId = $comment->getParentCommentId();
+                $repliesByParent[$parentId][] = $comment;
+            } else {
+                $mainComments[] = $comment;
+            }
+        }
+
     } catch (Exception $e){
         $_SESSION["message"] = "internal_error";
         exit();
diff --git a/php/model/Article.php b/php/model/Article.php
index 4b1d492..a0e1b65 100644
--- a/php/model/Article.php
+++ b/php/model/Article.php
@@ -7,13 +7,14 @@
  */
 class Article
 {
-    public $id;
-    public $title;
-    public $content;
-    public $author;
-    public $creationDate;
-    public $category;
-    public $tags;
+    private $id;
+    private $title;
+    private $content;
+    private $author;
+    private $creationDate;
+    private $category;
+    private $tags;
+    private $likes;
 
     /**
      * Konstruktor
@@ -26,7 +27,7 @@ class Article
      * @param $tags string optionale Schlagworte für eine bessere Suche
      * @param $creationDate string Datum der Beitragserstellung
      */
-    public function __construct(int $id, string $title, string $content, string $author, string $category, string $tags, string $creationDate)
+    public function __construct(int $id, string $title, string $content, string $author, string $category, string $tags, string $creationDate, array $likes = [])
     {
         $this->id = $id;
         $this->title = $title;
@@ -35,6 +36,7 @@ class Article
         $this->creationDate = $creationDate;
         $this->category = $category;
         $this->tags = $tags;
+        $this->likes = $likes;
     }
 
     /**
@@ -67,7 +69,7 @@ class Article
 
     /**
      * Gibt den Content eines Beitrags zurück.
-     * TODO: Content muss noch definiert werden.
+     *
      * @return string
      */
     public function getContent(): string
@@ -77,7 +79,7 @@ class Article
 
     /**
      * Setzt den Content eines Beitrags.
-     * TODO: Content muss noch definiert werden.
+     *
      * @param $content
      * @return void
      */
@@ -141,7 +143,34 @@ class Article
         $this->tags = $tags;
     }
 
+    /**
+     * Gibt alle User-IDs zurück, die diesen Beitrag geliked haben.
+     * @return array
+     */
+    public function getLikes(): array
+    {
+        return $this->likes;
+    }
 
+    /**
+     * Gibt die Gesamtzahl der Likes zurück.
+     * @return int
+     */
+    public function getLikeCount(): int
+    {
+        return count($this->likes);
+    }
+
+    /**
+     * Prüft, ob ein bestimmter Nutzer den Beitrag bereits geliked hat.
+     *
+     * @param string $userId
+     * @return bool
+     */
+    public function hasLiked(string $userId): bool
+    {
+        return in_array($userId, $this->likes);
+    }
 
 }
 ?>
\ No newline at end of file
diff --git a/php/model/ArticleManagerDAO.php b/php/model/ArticleManagerDAO.php
index 6dcf7e2..fea3d0c 100644
--- a/php/model/ArticleManagerDAO.php
+++ b/php/model/ArticleManagerDAO.php
@@ -92,6 +92,18 @@ interface ArticleManagerDAO
      */
     public function getArticlesByCategory($category);
 
+    /**
+     * Registriert oder entfernt ein Like eines Nutzers für einen Beitrag.
+     * Wenn schon geliked -> Unlike
+     * Wenn noch nicht geliked -> Like
+     *
+     * @param int $articleId Die ID des Beitrags
+     * @param string $userId Die ID des Nutzers
+     * @return bool True wenn geliked, False wenn unliked
+     * @throws InternalServerErrorException
+     * @throws NotFoundException
+     */
+    public function toggleLike(int $articleId, string $userId): bool;
 
 }
 ?>
\ No newline at end of file
diff --git a/php/model/DatabaseArticleManager.php b/php/model/DatabaseArticleManager.php
index 7d9f31b..ad49ea4 100644
--- a/php/model/DatabaseArticleManager.php
+++ b/php/model/DatabaseArticleManager.php
@@ -23,6 +23,7 @@ class DatabaseArticleManager implements ArticleManagerDAO {
 
                 $db = $this->getConnection();
 
+                // Tabelle für Beiträge
                 $db->exec("
                     CREATE TABLE articles (
                         id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -33,6 +34,15 @@ class DatabaseArticleManager implements ArticleManagerDAO {
                         tags TEXT,
                         created TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                     );");
+
+                // Tabelle für Likes
+                $db->exec("
+                CREATE TABLE likes (
+                    article_id INTEGER,
+                    user_id TEXT,
+                    PRIMARY KEY (article_id, user_id),
+                    FOREIGN KEY (article_id) REFERENCES articles(id) ON DELETE CASCADE
+                );");
                 unset($db);
             } catch (PDOException $e) {
                 throw new InternalServerErrorException($e->getMessage());
@@ -189,6 +199,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
             $row = $command->fetch(PDO::FETCH_ASSOC);
 
             if ($row) {
+                $likes = $this->getLikesForArticle(intval($row['id']));
+
                 return new Article(
                     intval($row['id']),
                     $row['title'],
@@ -196,7 +208,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
                     $row['author'],
                     $row['category'],
                     $row['tags'],
-                    $row['created']
+                    $row['created'],
+                    $likes
                 );
             }
 
@@ -254,6 +267,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
             $filteredArticles = [];
 
             foreach ($rows as $row) {
+                $likes = $this->getLikesForArticle(intval($row['id']));
+
                 $filteredArticles[] = new Article(
                     intval($row['id']),
                     $row['title'],
@@ -261,7 +276,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
                     $row['author'],
                     $row['category'],
                     $row['tags'],
-                    $row['created']
+                    $row['created'],
+                    $likes
                 );
             }
 
@@ -287,6 +303,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
             $filteredArticles = [];
 
             foreach ($rows as $row) {
+                $likes = $this->getLikesForArticle(intval($row['id']));
+
                 $filteredArticles[] = new Article(
                     intval($row['id']),
                     $row['title'],
@@ -294,7 +312,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
                     $row['author'],
                     $row['category'],
                     $row['tags'],
-                    $row['created']
+                    $row['created'],
+                    $likes
                 );
             }
 
@@ -341,6 +360,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
             $filteredArticles = [];
 
             foreach ($rows as $row) {
+                $likes = $this->getLikesForArticle(intval($row['id']));
+
                 $filteredArticles[] = new Article(
                     intval($row['id']),
                     $row['title'] ?? '',
@@ -348,7 +369,8 @@ class DatabaseArticleManager implements ArticleManagerDAO {
                     $row['author'] ?? '',
                     $row['category'] ?? '',
                     $row['tags'] ?? '',
-                    $row['created'] ?? '' // Nutzt 'created' aus deiner DB-Struktur
+                    $row['created'] ?? '',
+                    $likes
                 );
             }
 
@@ -359,4 +381,69 @@ class DatabaseArticleManager implements ArticleManagerDAO {
         }
     }
 
+    /**
+     * Holt alle User-IDs, die einen bestimmten Beitrag geliked haben.
+     *
+     * @return String[] UserIDs
+     * @throws InternalServerErrorException
+     */
+    private function getLikesForArticle(int $articleId): array
+    {
+        try {
+            $db = $this->getConnection();
+            $sql = "SELECT user_id FROM likes WHERE article_id = :article_id;";
+            $command = $db->prepare($sql);
+            $command->execute([':article_id' => $articleId]);
+
+            return $command->fetchAll(PDO::FETCH_COLUMN) ?: [];
+        } catch (PDOException $e) {
+            return [];
+        }
+    }
+
+    public function toggleLike(int $articleId, string $userId): bool
+    {
+        // prüfen, ob der Artikel überhaupt existiert
+        $article = $this->getArticle($articleId);
+        if (!$article) {
+            throw new NotFoundException("missing_id");
+        }
+
+        try {
+            $db = $this->getConnection();
+
+            // prüfen, ob das Like bereits existiert
+            $checkSql = "SELECT COUNT(*) FROM likes WHERE article_id = :article_id AND user_id = :user_id;";
+            $checkCommand = $db->prepare($checkSql);
+            $checkCommand->execute([
+                ':article_id' => $articleId,
+                ':user_id'    => $userId
+            ]);
+
+            $hasLiked = (int)$checkCommand->fetchColumn() > 0;
+
+            if ($hasLiked) {
+                // wenn bereits geliked -> Unlike
+                $deleteSql = "DELETE FROM likes WHERE article_id = :article_id AND user_id = :user_id;";
+                $deleteCommand = $db->prepare($deleteSql);
+                $deleteCommand->execute([
+                    ':article_id' => $articleId,
+                    ':user_id'    => $userId
+                ]);
+                return false; // gibt false zurück, da der Beitrag jetzt nicht mehr geliked ist
+            } else {
+                // wenn noch nicht geliked -> Like
+                $insertSql = "INSERT INTO likes (article_id, user_id) VALUES (:article_id, :user_id);";
+                $insertCommand = $db->prepare($insertSql);
+                $insertCommand->execute([
+                    ':article_id' => $articleId,
+                    ':user_id'    => $userId
+                ]);
+                return true; // gibt true zurück, da der Beitrag jetzt geliked ist
+            }
+
+        } catch (PDOException $e) {
+            throw new InternalServerErrorException("internal_error");
+        }
+    }
 }
\ No newline at end of file
diff --git a/php/model/LocalArticleManager.php b/php/model/LocalArticleManager.php
index 6df27e9..aab081a 100644
--- a/php/model/LocalArticleManager.php
+++ b/php/model/LocalArticleManager.php
@@ -62,7 +62,8 @@ class LocalArticleManager implements ArticleManagerDAO {
             "author" => $author,
             "category" => $category,
             "tags" => $tags,
-            "creationDate" => date("Y-m-d H:i:s")
+            "creationDate" => date("Y-m-d H:i:s"),
+            "likes" => []
         ];
 
         $this->saveArticle($articles);
@@ -92,7 +93,8 @@ class LocalArticleManager implements ArticleManagerDAO {
                     "author" => $author,
                     "category" => $article->getCategory(),
                     "tags" => $article->getTags(),
-                    "creationDate" => $article->getCreationDate()
+                    "creationDate" => $article->getCreationDate(),
+                    "likes" => $storedArticle['likes'] ?? []
                 ];
                 $updated = true;
                 break;
@@ -142,7 +144,17 @@ class LocalArticleManager implements ArticleManagerDAO {
 
         foreach ($articles as $article) {
             if (isset($article['id']) && $article['id'] == $id) {
-                return new Article(intval($article['id']), $article['title'], $article['content'], $article['author'], $article['category'], $article['tags'], $article['creationDate']);
+                $likes = isset($article['likes']) && is_array($article['likes']) ? $article['likes'] : [];
+                return new Article(
+                    intval($article['id']),
+                    $article['title'],
+                    $article['content'],
+                    $article['author'],
+                    $article['category'],
+                    $article['tags'],
+                    $article['creationDate'],
+                    $likes
+                    );
             }
         }
 
@@ -168,6 +180,7 @@ class LocalArticleManager implements ArticleManagerDAO {
 
         foreach ($articles as $article) {
             if (isset($article['author']) && $article['author'] == $author) {
+                $likes = isset($article['likes']) && is_array($article['likes']) ? $article['likes'] : [];
                 $filteredArticles[] = new Article(
                     intval($article['id']),
                     $article['title'],
@@ -175,7 +188,8 @@ class LocalArticleManager implements ArticleManagerDAO {
                     $article['author'],
                     $article['category'],
                     $article['tags'],
-                    $article['creationDate']
+                    $article['creationDate'],
+                    $likes
                 );
             }
         }
@@ -201,6 +215,7 @@ class LocalArticleManager implements ArticleManagerDAO {
             if (($cleanKeyword !== '' && strpos($title, $cleanKeyword) !== false) ||
                 ($cleanKeyword !== '' && strpos($content, $cleanKeyword) !== false)) {
 
+                $likes = isset($article['likes']) && is_array($article['likes']) ? $article['likes'] : [];
                 $filteredArticles[] = new Article(
                     intval($article['id'] ?? 0),
                     $article['title'] ?? '',
@@ -208,7 +223,8 @@ class LocalArticleManager implements ArticleManagerDAO {
                     $article['author'] ?? '',
                     $article['category'] ?? '',
                     $article['tags'] ?? '',
-                    $article['creationDate'] ?? ''
+                    $article['creationDate'] ?? '',
+                    $likes
                 );
             }
         }
@@ -223,6 +239,7 @@ class LocalArticleManager implements ArticleManagerDAO {
 
         foreach ($articles as $article) {
             if (isset($article['category']) && $article['category'] == $category) {
+                $likes = isset($article['likes']) && is_array($article['likes']) ? $article['likes'] : [];
                 $filteredArticles[] = new Article(
                     intval($article['id']),
                     $article['title'],
@@ -230,12 +247,53 @@ class LocalArticleManager implements ArticleManagerDAO {
                     $article['author'],
                     $article['category'],
                     $article['tags'],
-                    $article['creationDate']
+                    $article['creationDate'],
+                    $likes
                 );
             }
         }
         return $filteredArticles;
     }
 
+    public function toggleLike(int $articleId, string $userId): bool
+    {
+        $articles = $this->getAllArticles();
+        $articleFound = false;
+        $isLikedNow = false;
+
+        foreach ($articles as $index => $article) {
+            if (isset($article['id']) && $article['id'] == $articleId) {
+                $articleFound = true;
+
+                // Likes-Array initialisieren, falls nicht vorhanden
+                if (!isset($articles[$index]['likes']) || !is_array($articles[$index]['likes'])) {
+                    $articles[$index]['likes'] = [];
+                }
+
+                $likeIndex = array_search($userId, $articles[$index]['likes']);
+
+                if ($likeIndex !== false) {
+                    // Bereits geliked -> Unlike
+                    unset($articles[$index]['likes'][$likeIndex]);
+                    // Array-Keys neu indizieren, damit JSON sauber bleibt
+                    $articles[$index]['likes'] = array_values($articles[$index]['likes']);
+                    $isLikedNow = false;
+                } else {
+                    // Noch nicht geliked -> Like (User-ID hinzufügen)
+                    $articles[$index]['likes'][] = $userId;
+                    $isLikedNow = true;
+                }
+                break;
+            }
+        }
+
+        if (!$articleFound) {
+            throw new NotFoundException("missing_id");
+        }
+
+        $this->saveArticle($articles);
+        return $isLikedNow;
+    }
+
 }
 ?>
\ No newline at end of file