feat: post manager filtering by tags

src/app/baseclasses/BaseManager.php

@@ -21,6 +21,11 @@ abstract class BaseManager
     return self::$instance;
   }
 
+  public static function arrToSQLArr($array)
+  {
+    return "{" . implode(",", $array) . "}";
+  }
+
   public function getPDO()
   {
     return $this->pdo;

src/app/modelmanagers/PostManager.php

@@ -27,7 +27,8 @@ class PostManager extends BaseManager
   }
 
   public function getByTags($tags = []) {
-    $where = ['tags' => ["@>", $tags, PDO::PARAM_STR]];
+    $arrTags = BaseManager::arrToSQLArr($tags);
+    $where = ['tags' => ["@>", $arrTags, PDO::PARAM_STR]];
   }
 
   public function getReplies($post_id, $owner_id)