Make a better database interactions

Core/Model.php

@@ -5,20 +5,18 @@ use App\Config;
 
 abstract class Model
 {
-    protected static $dsn;
+    protected static $conn = null;
 
     protected static function connectDB()
     {
-        static $conn = null;
-
         try {
-            if (!$conn) {
+            if (!self::$conn) {
                 $dsn = 'mysql:host='.Config::DB_HOST.';dbname='.Config::DB_DB;
-                $conn = new \PDO($dsn, Config::DB_UNAME, Config::DB_PWD);
+                self::$conn = new \PDO($dsn, Config::DB_UNAME, Config::DB_PWD);
 
-                $conn->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
+                self::$conn->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
             }
-            return $conn;
+            return self::$conn;
         } catch (PDOException $e) {
             echo $e->getMessage();
         }