Callbacks can be added to be executed when callback queries are called.

CHANGELOG.md

@@ -5,6 +5,7 @@ Exclamation symbols (:exclamation:) note something of importance e.g. breaking c
 
 ## [Unreleased]
 ### Added
+- Callbacks can be added to be executed when callback queries are called.
 ### Changed
 ### Deprecated
 ### Removed

src/Commands/SystemCommands/CallbackqueryCommand.php

@@ -18,6 +18,11 @@ use Longman\TelegramBot\Request;
  */
 class CallbackqueryCommand extends SystemCommand
 {
+    /**
+     * @var callable[]
+     */
+    protected static $callbacks = [];
+
     /**
      * @var string
      */
@@ -46,6 +51,21 @@ class CallbackqueryCommand extends SystemCommand
         //$query_id       = $callback_query->getId();
         //$query_data     = $callback_query->getData();
 
+        // Call all registered callbacks.
+        foreach (self::$callbacks as $callback) {
+            $callback($this->getUpdate()->getCallbackQuery());
+        }
+
         return Request::answerCallbackQuery(['callback_query_id' => $this->getUpdate()->getCallbackQuery()->getId()]);
     }
+
+    /**
+     * Add a new callback handler for callback queries.
+     *
+     * @param $callback
+     */
+    public static function addCallbackHandler($callback)
+    {
+        self::$callbacks[] = $callback;
+    }
 }