Add clean method

Author: QuentinBubu

src/Session/Session.php

@@ -146,6 +146,17 @@ public static function changeSessionLifetime(int $newLifetime)
         $_SESSION = $tempSession;
     }
 
+    /**
+     * Clean session data
+     *
+     * @return void
+     */
+    public static function clean(): void
+    {
+        self::start();
+        foreach ($_SESSION as $key => $value) unset($_SESSION[$key]);
+    }
+
     /**
      * Destroy a session
      *