Added callback for testability and extensibility.

README.md

@@ -110,6 +110,16 @@ This package has the following options (showing its respective defaults):
      */
     'onDisconnectCallback' => null,
 
+    /**
+     * Callback for Reconnection moment.
+     * Passed parameters:
+     *   - \WebSocket\Client $client
+     *   - int \Throwable $e
+     *
+     * @var ?callable
+     */
+    'onReconnectionCallback' => null,
+
     /**
      * When positive, considered in seconds
      *

src/Client.php

@@ -44,6 +44,13 @@ class Client implements ClientInterface
      */
     protected $onMessageCallback = null;
 
+    /**
+     * Callback for Reconnection moment.
+     *
+     * @var callable|null
+     */
+    protected $onReconnectionCallback = null;
+
     /**
      * Connection timeout.
      *
@@ -143,6 +150,14 @@ private function startConnection()
 
     private function handleReconnection(Throwable $e)
     {
+        if (is_callable($this->onReconnectionCallback)) {
+            call_user_func(
+                $this->onReconnectionCallback,
+                $this,
+                $e,
+            );
+        }
+
         if (
             $this->reconnect
             && (